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Japan
Cross-Sectional Studies
Prevalence
Students
Time Factors
Age Factors
Health Surveys
Comorbidity
Severity of Illness Index
Risk Assessment
Incidence
Questionnaires
Alcohol Drinking
Adolescent Behavior
Smoking
Life Style
Sleep Initiation and Maintenance Disorders
Disorders of Excessive Somnolence
Dyssomnias
Schools
Co-Publications
13
11
10
8
7
6
3
2
1
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