Thema
Comparative Study
Journal Article
653
Incidence
298
Research Support, Non-U.S. Gov't
203
incidence
170
Measurement
160
Research Methodology
156
Diseases
120
Biology
82
Population
82
Family Planning
81
Studies
81
Demographic Factors
75
Multicenter Study
74
Developing Countries
68
Physiology
68
Developed Countries
64
Population Characteristics
61
Contraception
55
Age Factors
51
Comparative Studies
48
Mortality
48
Population Dynamics
46
Americas
40
Randomized Controlled Trial
40
Klinische Studie
37
Infections
37
Reproduction
37
Observational Study
36
Examinations And Diagnoses
35
Europe
34
Health
34
Research Support, N.I.H., Extramural
34
epidemiology
32
North America
30
Treatment
30
Epidemiology
29
Prevalence
29
mortality
28
Africa
25
Asia
25
United States
25
Review
24
Data Analysis
23
Evaluation
23
Northern America
23
Laboratory Examinations And Diagnoses
22
Northern Europe
21
Research Report
21
Research Support, U.S. Gov't, Non-P.H.S.
21
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