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Hygiene
11
United States
8
Sanitation
7
Health Surveys
6
Vital Statistics
6
Waste Management
6
Water Supply
6
Internal Medicine -- methods
5
Mental Disorders
5
Treatment Outcome
5
Diet
4
Diet Therapy
4
Medicine
4
Physiological Phenomena
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Sewage
4
Symptom Assessment
4
Child
3
Child Care
3
Health Behavior
3
History of Medicine
3