B R I T I S H J O U R N A L O F P S YC H I AT RY ( 2 0 0 4 ) , 1 8 5 , 3 9 9 ^ 4 0 4
Anxiety and the risk of death in older men
and women
HEIN P. J. VAN HOUT, AARTJAN
A ARTJAN T. F. BEEKMAN, EDWIN DE BEURS,
HANNIE COMIJS, HARM VAN MARWIJK, MARTEN DE HAAN,
HA AN,
WILLEM VAN TILBURG and DORLY J. H. DEEG
Background There are inconsistent
reports as to whether people with anxiety
disorders have a higher mortality risk.
Aims To determine whether anxiety
disorders predict mortality in older men
and women in the community.
Method Longitudinal data were used
from a large, community-based random
sample (n
(n¼3107)
3107) of older men and women
(55^85 years) inThe Netherlands, with a
follow-up period of 7.5 years. Anxiety
disorders were assessed according to
DSM ^ III criteria in a two-stage screening
design.
Results In men, the adjusted mortality
risk was1.78 (95% CI1.01^3.13) in cases
with diagnosed anxiety disorders at
baseline.In women, no significant
association was found with mortality.
Conclusions The study revealed a
gender difference in the association
between anxiety and mortality.For men,
but notfor women, anincreased mortality
risk was found for anxiety disorders.
Declaration of interest
None.
Although the elevated mortality risk in
depression is well established (Cuijpers,
2001), comparable studies of the risks of
anxiety are sparse and inconsistent (Coryell
et al,
al, 1986; Johnson et al,
al, 1990; Weissman
et al,
al, 1990; Allgulander & Lavori, 1991;
Herrmann et al,
al, 2000; Warshaw et al,
al,
2000; Joukamaa et al,
al, 2001). An explanation for the inconsistency of reported
mortality risks of patients with anxiety disorders may be the failure to control for the
effects of comorbid depression, socioeconomic status and unhealthy lifestyles in
some studies. These variables are related
both to anxiety disorders and to subsequent
mortality, and may cause spurious relationships between anxiety and mortality (Honig
et al,
al, 1992; Lasser et al,
al, 2000).
The main objective of this study was to
determine whether anxiety disorders
predict mortality in older people in the
community. Subsidiary objectives were to
filter out the effect of comorbid depression,
to compare men and women, and to
explore the effects of potential explanatory
(lifestyle) and confounding variables.
METHOD
Design and sample
Data were collected in the context of the
Longitudinal Aging Study Amsterdam
(LASA). This is an ongoing longitudinal
research effort on determinants and consequences of changes in well-being and
autonomy in older people. The analyses
were based on the data of 659 independently living community residents. Data
collection procedures and response have
been described in more detail elsewhere
(Beekman et al,
al, 1995a
1995a; Geerlings et al,
al,
2000). In short, a random sample was
drawn from the population registers of
11 municipalities in three geographic areas
in The Netherlands. At baseline 3805
residents, aged 55–85 years, were
approached to participate in the study. This
sample was pre-stratified by age and
gender. The older age strata and men were
oversampled in anticipation of higher attrition rates during the course of the study.
Owing to initial non-response (n
(n¼698)
698) and
item non-response (n
(n¼51),
51), 3056 persons
were interviewed at baseline. These participants gave their informed consent and
agreed to be interviewed in their homes. Of
the non-responders, 126 had died before
approach; 44 could not be contacted, 134
were too ill or cognitively impaired to be
interviewed, and 394 were unwilling to
participate (Van Exel et al,
al, 2000).
Participants with anxiety disorders
were identified using a two-stage screening
design (Duncan-Jones & Henderson,
1978). The Center for Epidemiological
Studies Depression Scale (CES–D; Radloff,
1977) was used as the screening instrument,
using the generally recommended cut-off
score of 16 or over. This scale was found
to be a good screen for both anxiety and
depression (sensitivity 0.79). The second
stage of case-finding involved a diagnostic
interview, held 2–8 weeks after the first
LASA assessment, with everyone who
screened positive and an equally large
random subsample of participants who
screened negative. The response at this
stage was 86.0% and attrition was related
to age but not to gender, leaving a study
sample of 659 persons interviewed, of
whom 332 were ‘screen positives’ and 327
‘screen negatives’ (Beekman et al,
al, 1995b
1995b).
Informed consent was obtained from
everyone who participated in the study.
Participants were interviewed in their
homes by well-trained and intensively
supervised interviewers. These interviewers
were trained to conduct only the baseline
assessment or the diagnostic interview,
ensuring that no participant was interviewed by the same person twice.
Measurements
Psychopathology
Both anxiety disorders and comorbid major
depressive disorder were defined according
to DSM–III criteria (American Psychiatric
Association, 1980) and assessed by means
of the Diagnostic Interview Schedule (DIS;
Robins et al,
al, 1981). In this study four
anxiety disorders were assessed: phobic,
panic, generalised anxiety and obsessive–
compulsive disorders. The analyses were
based on anxiety disorders and major
depression experienced in the 6 months
prior to interview.
399
VA N HOU T E T A L
Death
Death certificates were traced through the
registries of the municipalities in which
the respondents were registered. Vital
status ascertainment was complete. All
deaths were recorded that occurred
between the baseline interview (September
1992 to September 1993) and 1 January
2000. The average follow-up period lasted
7.5 years (s.d.¼0.3).
(s.d. 0.3).
Covariates
Potential explanatory variables included
the lifestyle variables smoking, drinking,
body mass index and physical activity
(walking, cycling, light and heavy household activities, and sports; Visser et al,
al,
1997).
Potentially confounding or effectmodifying variables, assessed at the study
baseline, included demographic characteristics (age, gender, socio-economic status,
marital status and urbanisation). As a
measure of socio-economic status we used
a weighted score composed of level of
education, occupation and income (range
0–100) (van Tilburg et al,
al, 1995; Visser et
al,
al, 1997). Psychiatric treatment status was
measured and concerned contacts with a
psychiatrist or psychological and appropriate psychotropic medication. An earlier
account described the treatment rates (de
Beurs et al,
al, 1999). Functional limitations
(restrictions in performing daily physical
activities) were measured using an adaptation of an Organisation for Economic
Co-operation and Development (OECD)
questionnaire (van Sonsbeek, 1988). Cognitive functioning was assessed with the
Mini-Mental State Examination (Folstein
et al,
al, 1975). Chronic physical diseases were
assessed in detail, including cardiac
diseases, arteriosclerosis, stroke (excluding
transient ischaemic attacks), diabetes mellitus, cancer, lung diseases (chronic obstructive pulmonary disease) and arthritis.
Other chronic diseases were assessed in less
detail. The validity of the instrument was
supported in a previous study by crosschecking responses with the respondents’
general practitioners (Kriegsman et al,
al,
1996; Visser et al,
al, 1997).
Statistical analyses
The socio-demographic, morbidity, treatment status and lifestyle characteristics of
survivors and deceased were compared by
means of w2 or t-tests. Mortality rates per
400
1000
person-years
were
calculated
according to anxiety status. When the
95% confidence intervals of the hazard
ratio did not include the value 1, the association was considered to be statistically
significant.
Cox proportional hazard regression
models were used to examine the association between anxiety disorders and time
to death in men and women and with adjustment of the explanatory (lifestyle) and
confounding variables (age, disease, disability, cognition). We explored potential effect
modification of the relation between anxiety and mortality by the socio-demographic, comorbid depression, physical
morbidity, physical disability, cognitive
functioning and lifestyle variables, by interactions in Cox survival models. For the
same variables we checked whether these
confounded the relation between mortality
and anxiety. Significant interaction was
only found between gender, anxiety and
mortality. The survival curve for men
showed a positive association between
anxiety and mortality rate, whereas for
women it did not. We therefore present
the outcomes separately for men and
women. Also the confounders were
analysed separately for men and women.
Additional sensitivity analyses were
performed to investigate whether the effects
were maintained when controlling for
depression (both for depressive disorder
and depressive symptoms) and for ongoing
psychiatric treatment.
RESULTS
Characteristics of the sample
The mean age of the 659 respondents was
70.6 years; 380 (57.6%) were women. In
the study sample 112 (17.0%) had an
anxiety disorder. Nineteen persons (3.1%)
had more than one anxiety disorder and
29 (4.4%) had both anxiety and depressive
disorders. Generalised anxiety disorder was
present in the previous 6 months in 77
persons, panic disorder in 16 persons,
phobia in 36 persons and obsessive–
compulsive disorder in 9 persons (all 9 were
women) (Table 1). Extrapolation of the 6month prevalence of anxiety disorders to
the entire LASA study sample yielded an
estimated prevalence of 10.2% (Beekman
et al,
al, 1998). The baseline characteristics
differed between men and women on
several variables. Notably more women
than men suffered from anxiety disorders
and comorbid depression; men suffered
more from cardiac diseases, stroke and
chronic obstructive pulmonary disease;
considerably more men smoked than
women.
Compared with the non-anxious group,
people with an anxiety disorder were older,
more likely to be female, less likely to be
married, more often living in urban areas,
had lower socio-economic status, suffered
more from chronic physical illnesses and
were less physically active. The number of
anxious persons treated by a psychiatrist
or psychotropic medication was low (Table
1). Women with anxiety disorder were
more likely to be treated at follow-up than
men.
After 7.5 years, in total 199 (30.2%)
persons had died. Of the men, 110
(39.4%) had died compared with 89
(23.4%) of the women. Univariate analyses
between mortality and socio-demographic
characteristics, chronic diseases, lifestyle
and the anxiety screening score at baseline
revealed significant associations on all variables except for urbanisation and arthritis.
This indicates that the association between
anxiety and mortality may be confounded
by several variables.
Table 2 shows the number of cases of
anxiety, the number deceased, the number
of person-years and the mortality rate at
7.5-year follow-up. The unadjusted mortality rates suggest that the mortality risk is
(slightly) elevated in respondents with an
anxiety disorder. There was a substantial
difference between men and women. The
gender6
gender6anxiety interaction term in the
age-adjusted model was found to be statistically significant (Wald test 6.3, d.f.¼1,
d.f. 1,
P¼0.04).
0.04).
Anxiety disorder and mortality
Three (potential) confounders were found,
and these were similar for men and women:
age, functional limitations and the number
of chronic diseases. Neither the chronic diseases alone nor cognitive impairment
affected the relationship between anxiety
and mortality. In our sample, 26% of
people with an anxiety disorder also met
criteria for major depression. In men
14.7% of the patients with anxiety disorder
had comorbid depression compared with
31.2% in women. However, adjustment
for baseline depression did not change the
mortality risk of anxiety.
Activity level was the only explanatory
variable that substantially changed the
A NX I E T Y A N
ND
D R I S K OF D E AT H
Table 1 Baseline characteristics and anxiety disorders among men and women (unweighted percentages;
n¼659)
659)
Men (n
(n¼279)
279)
Women (n
(n¼380)
380)
Difference
Any anxiety disorder past 6 months
35 (12.5)
77 (20.3)
w2¼6.8**
6.8**
Generalised anxiety disorder
24 (8.6)
53 (14.1)
w2¼4.2*
4.2*
3 (1.1)
13 (3.4)
w2¼3.7
3.7
12 (4.3)
24 (6.3)
w2¼1.2
1.2
Anxiety disorder, n (%)
Panic disorder
Phobia
0
More than one anxiety disorder
3 (1.1)
16 (4.2)
w2¼8.9,
8.9, d.f.¼3**
d.f. 3**
Comorbid depressive disorder, n (%)
5 (1.8)
24 (6.3)
w2¼10.2**
10.2**
Psychiatric treatment, n (%)
8 (2.9)
11 (2.9)
w2¼0.001
0.001
11 (3.9)
26 (6.8)
w2¼5.2*
5.2*
Age, years: mean (s.d.)
70.9 (8.8)
70.5 (8.7)
t¼1,2
1,2
Socio-economic status score: mean (s.d.)
36.7 (18.8)
31.1 (19.2)
t¼8.1***
8.1***
Married, n (%)
187 (67)
165 (43.4)
w2¼201***
201***
Urbanised (lived in Amsterdan), n (%)
83 (29.7)
122 (32.1)
w2¼0.4
0.4
166 (59.5)
260 (68.4)
w2¼8.7,
8.7, d.f.¼2*
d.f. 2*
Cardiac diseases
84 (30.1)
64 (16.8)
w2¼41***
41***
Peripheral arteriosclerosis
36 (12.8)
45 (11.8)
w2¼0.3
0.3
Stroke
21 (7.5)
22 (5.8)
w2¼11.1**
11.1**
Diabetes
18 (6.4)
39 (10.3)
w2¼1.3
1.3
COPD
46 (16.4)
46 (12.1)
w2¼7.5**
7.5**
Cancer
25 (9)
46 (12.1)
w2¼19.7***
19.7***
Osteoarthritis
68 (24.4)
179 (47.1)
w2¼133***
133***
Rheumatoid arthritis
15 (5.3)
33 (8.7)
w2¼25***
25***
Score 524, n (%)
27 (9.6)
44 (11.6)
w2¼1.7
1.7
Mean score (s.d.)
26.9 (3)
26.9 (3)
t¼0.4
0.4
1.1 (2)
1.8 (2.6)
t¼7
78.6***
w2¼65,
65, d.f.¼2***
d.f. 2***
Psychotropic medication, n (%)
9 (2.4)
w2¼6.6**
6.6**
OCD
magnitude of the relation between anxiety
and mortality; smoking, drinking and body
mass index hardly affected it (Table 3).
Adjustment for ongoing treatment status
had no effect on the hazard ratios.
Finally, in the fully adjusted model,
anxiety disorders had a hazard ratio for
subsequent mortality in men of 1.78 (95%
CI 1.01–3.13) and in women of 0.89
(95% CI 0.51–1.56) (Table 3). The survival
curves according to the adjusted Cox model
are shown in Fig. 1 for men and in Fig. 2 for
women.
DISCUSSION
Sociodemographic factors
Morbidity, n (%)
Any chronic disease
An association between anxiety disorders
and subsequent mortality was found for
men only. Older men with diagnosed
anxiety disorders had 87% higher risk of
mortality over 7 years of follow-up. The
associations between anxiety and mortality
in men remained after adjustment for comorbid depression, the explanatory variables (activity, smoking, drinking, body
mass index) and confounders (age, psychiatric treatment, functional limitations
and chronic diseases, including heart disease and stroke). In women with anxiety
disorders no association was found with
subsequent mortality.
MMSE
Functional limitations1
Mean score (s.d.)
No difficulties, n (%)
159 (57.0)
175 (46.5)
1^2 difficulties, n (%)
52 (18.6)
70 (18.6)
42 difficulties, n (%)
66 (23.7)
131 (34.8)
22.6 (2.9)
22.2 (3.7)
Lifestyle
BMI, kg/m2: mean (s.d.)
t¼7
72.8**
Physical activity2
Score: mean (s.d.)
3.4 (1.4)
3.4 (1.5)
t¼0.3
0.3
31 (11.2)
48 (12.7)
w2¼3,
3, d.f.¼2
d.f. 2
Moderate, n (%)
106 (38.4)
145 (38.3)
High, n (%)
139 (50.4)
186 (49.1)
52 (18.7)
123 (32.5)
w2¼235***,
235***,
Daily
45 (16.2)
116 (30.7)
d.f.¼3
d.f. 3
1^6 days a week
77 (27.7)
76 (20.1)
104 (37.4)
63 (16.7)
103 (39.1)
66 (17.4)
Low, n (%)
Alcohol consumption, n (%)
Never
51^3 days a month
Currently smoking, n (%)
w2¼94***
94***
BMI, body mass index; COPD, chronic obstructive pulmonary disease; MMSE, Mini-Mental State Examination; OCD,
obsessive ^ compulsive disorder.
1. Ability to perform basic physical actions used in daily living.
2. Range 0 ^5 sum score of walking, bicycling, household activities (light and heavy), sports; 0 ^1 low, 2^3 moderate,
4 ^5 high.
*P50.05, **P
**P50.01, ***P
***P50.001.
Explanations
Several plausible mechanisms for the link
between affective disorders and mortality
exist, of which pathophysiological and
behavioural explanations are the most
important. Physiological alterations have
been described which include impairment
of platelet function and decreased heart
rate variability as a consequence of an
imbalance in the autonomic tone (Kawachi
et al,
al, 1995; Musselman et al,
al, 1998). Also,
immune activation and hypercortisolaemia
as stress responses may result in decreased
insulin resistance and increased steroid production and blood pressure, thereby increasing the risk of cardiac disease
(Musselman et al,
al, 1998). However, these
studies investigated people with affective
disorders, thus combining anxiety and
depressive disorders. We are not aware of
any pathophysiological study on specific
anxiety disorders. It is likely that anxious
people are less compliant with treatment
recommendations and are less willing to
exercise and eat healthily, which may partly
explain our results (DiMatteo et al,
al, 2000).
4 01
VA N HOU T E T A L
T
Table
able 2
Anxiety cases, number of deceased, person-years and mortality rate at 7.5-year follow-up
Total
Cases
Deaths
n
n
n
Person-years
Mortality rate per
1000 person-years1
(95% CI)
All participants
659
No anxiety disorder
547
164
3170
51.7 (44.1^60.3)
Anxiety disorder
112
35
626
55.9 (38.9^77.8)
244
93
1350
68.9 (55.6^84.4)
35
17
161
105.6 (61.5^169.1)
303
71
1820
40.7 (31.9^51.0)
77
18
465
38.7 (22.9^61.2)
Men
279
No anxiety disorder
Anxiety disorder
Women
380
No anxiety disorder
Anxiety disorder
Fig. 1 Cumulative mortality rate for men with an
1. (Deaths/person-years)6
(Deaths/person-years)61000.
anxiety disorder (grey line) and without an anxiety
disorder (black line), based on fully adjusted Cox
T
Table
able 3
Mortality risks for men and women with or without anxiety disorders at baseline
Total2
n
hazard models.
Crude hazard ratio Adjusted hazard ratio1
Ratio (95% CI)
Ratio (95% CI)
Men
1. No anxiety disorder
222
Reference
Anxiety disorder
31
1.65 (0.98^2.78)
1.78 (1.01^3.13)*
42
1.77 (1.10^2.83)*
2.41 (1.36^4.25)*
4
^3
^3
2. Anxiety or depressive disorder
3. Anxiety and depressive disorders
Women
1. No anxiety disorder
297
Reference
Anxiety disorder
76
1.00 (0.59^1.71)
0.89 (0.51^1.56)
2. Anxiety or depressive disorder
96
0.95 (0.58^1.56)
0.63 (0.31^1.28)
3. Anxiety and depressive disorders
24
1.73 (0.84^3.60)
2.93 (0.81^10.61)
1. Adjusted for age, physical limitations, physical activity, number of chronic diseases, ever smoked, alcohol, body mass
index and comorbid depressive disorder (the last not in 2 and 3).
2. Totals differ betweenTables 2 and 3 owing to missing data on one of the covariates in the model.
3. Number too small for reliable analysis.
*P50.05.
A possible explanation for the gender
difference is that men have more cardiovascular disorders, the course of which
could be affected more strongly by comorbid anxiety. A psychological explanation might be that men are less capable of
dealing with feelings of anxiety and hopelessness than women. Women are more inclined to discuss such feelings with others,
are more open to accepting support from
others, and may therefore be better able
to cope with feelings of anxiety (Verbrugge,
1985). Also, men are less inclined than
women to report feelings of anxiety. If they
nevertheless do report them, their condition
may be worse than that of their female
counterparts, which can have a greater impact on their physical health and may lead
to earlier death. Another explanation might
be that anxious elderly men more often die
4 02
Fig. 2
by suicide than their female counterparts.
However, causes of death were studied in
our sample in an earlier account, but
suicide did not explain the excess mortality
(Penninx et al,
al, 1999).
Earlier studies
The (weighted) prevalence of anxiety disorders in our study is comparable with
other community-based studies among the
elderly (Flint, 1994). Mortality figures for
people
with
anxiety
disorders
in
community-based samples are rare and
conflicting. In a large German cohort study
with 5 years of follow-up, anxiety symptoms were associated with improved survival (Hermann et al,
al, 2000). In contrast,
in a large community-dwelling cohort with
a follow-up period of 17 years (Joukamaa
Cumulative mortality rate for women with
an anxiety disorder (grey line) and without an anxiety disorder (black line), based on fully adjusted Cox
hazard models.
et al,
al, 2001), the authors were unable to find
significant associations between phobias
and mortality rate. In an earlier study
among in-patients with anxiety disorders
excess mortality was reported, of which a
third was due to suicide (Allgulander &
Lavori, 1991). Studies of out-patients with
anxiety disorders confirmed the excess
mortality but found a much lower suicide
rate (Coryell, 1988; Johnsson Fridell et al,
al,
1996; Warshaw et al,
al, 2000). Two small
US studies among out-patients with panic
disorder reported a doubled mortality rate
(Coryell et al,
al, 1982; Weissman et al,
al,
A NX I E T Y A N
ND
D R I S K OF D E AT H
1990). However, a confirmation study
some years later by Coryell et al (1986)
found less evidence for this relationship.
Strengths and limitations
Our study was the first to combine a long
follow-up period (7.5 years) with formal
diagnosis of anxiety in a general population
sample and complete mortality data. Also,
our extensive biological, psychological and
sociological baseline measurements enabled
identification and adjustment for confounders. A first limitation was that the diagnoses were based on DSM–III nosology;
the results therefore cannot be extrapolated
to people meeting DSM–IV criteria for
anxiety disorders (American Psychiatric
Association, 1994). This is especially relevant since a large portion of the sample
were diagnosed with generalised anxiety
disorder, for which the DSM–IV criteria
are more stringent. Second, generalisation
of our findings is limited by non-response;
this was largely due to oversampling of
the ‘older old’, who were more likely to
withdraw from the study because of health
problems, cognitive problems or death.
Thus, the sample may underrepresent the
frailest group, and generalisation of our
findings to this section of the population
is limited. However, for the study’s purpose
of investigating the associations between
variables, good representation on all variables is far more important. Also, it should
be noted that selective attrition of the most
frail is more likely to have resulted in too
conservative an estimate, rather than exaggerating the impact of anxiety on mortality.
Third, with our data it is difficult to disentangle cause and effect: it remains unclear
whether a worse health status leads to anxiety, or conversely whether anxiety leads to
a worse health status and subsequent greater mortality. Finally, further analyses
should take the cause of death into account
as well. This might shed more light on the
mechanism of increased mortality rates
among men.
Implications
An important consequence of our findings
for health policy is that it is important to
treat anxiety in older people. In our study
few elderly people with anxiety disorders
received treatment. There are several treatment options available for anxiety disorders. Although there are only a few
treatment effect studies among elderly
CLINICAL IMPLICATIONS
& A major consequence of our findings for health policy is that it is important to
treat anxiety in older people.
To increase the number of treated patients, better recognition and patient
empowerment are key issues.
&
& The next steps for research would be to look into the causes of death associated
with anxiety and to explore further sociopsychological and pathophysiological
differences between men and women.
LIMITATIONS
The diagnoses were based on DSM^III nosology and therefore our results cannot
be extrapolated to people meeting current DSM^IV criteria for anxiety disorders.
&
The sample may underrepresent the frailest individuals and generalisation of our
findings to this portion of the population is limited.
&
& Our data make it difficult to disentangle cause and effect; it remains unclear
whether a worse health status leads to anxiety, or conversely whether anxiety leads
to a worse health status and subsequent mortality.
HEIN P. J.VAN HOUT, PhD, Department of General Practice, AARTJAN T. F. BEEKMAN, MD, PhD,
Department of Psychiatry, Institute for Research in Extramural Medicine,VU University Medical Centre,
Amsterdam; EDWIN DE BEURS, PhD, Department of Psychiatry, Leiden University Medical Centre, Leiden;
HANNIE COMIJS, PhD, Department of Psychiatry, HARM VAN MARWIJK, MD, PhD, MARTEN DE HAAN, MD,
PhD, Department of General Practice,WILLEM VAN TILBURG, MD, PhD, DORLY J. H. DEEG, PhD, Department
of Psychiatry, Institute for Research in Extramural Medicine,VU University Medical Centre, Amsterdam, The
Netherlands
Correspondence: Mr Hein van Hout, Department of General Practice, Institute for Research in
Extramural Medicine,VU University Medical Centre,Van der Boechorststraat 7, 1081BTAmsterdam,
The Netherlands.Tel: +31 20 444
448199;
48199; fax: +31 20 444
448361;
48361; e-mail: Hpj.vanhout@
Hpj.vanhout @vumc.nl
(First received 15 September 2003, final revision 16 April 2004, accepted 31 May 2004)
people, there is no reason to expect the efficacy of treatment to diminish with age. The
next steps for research are to look into the
causes of death associated with anxiety, to
explore further the sociopsychological and
pathophysiological differences between
men and women, and to test the effect of
interventions.
ACKNOWLEDGEMENT
This research was primarily funded by the Ministry
of Health Welfare and Sports.
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