Thema
Americas
82
Developed Countries
82
North America
82
Northern America
82
United States
Journal Article
73
Diseases
48
Demographic Factors
39
Population
39
Research Methodology
32
Population Dynamics
31
Biology
30
Developing Countries
29
Research Support, U.S. Gov't, P.H.S.
28
Family Planning
27
Physiology
25
Population Characteristics
22
Health
21
Viral Diseases
21
Research Support, Non-U.S. Gov't
20
Hiv Infections
19
Mortality
18
Studies
18
Age Factors
17
Delivery Of Health Care
16
Research Report
15
Reproduction
14
Behavior
13
Contraception
13
Fertility Control, Postconception
13
Economic Factors
12
Examinations And Diagnoses
12
Differential Mortality
11
Pregnancy
11
Socioeconomic Factors
10
Abortion, Induced
9
Acquired Immunodeficiency Syndrome
9
Fertility
9
Health Services
9
Antibodies, Viral
8
Causes Of Death
8
Comparative Study
8
Contraceptive Methods
8
Cultural Background
8
Endocrine System
8
Ethnic Groups
8
Evaluation
8
Body Weight
7
Contraceptive Agents
7
Contraceptive Agents, Female
7
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