Thema
Age Factors
440
Comparative Study
Demographic Factors
440
Population
440
Youth
Population Characteristics
439
Journal Article
435
Research Methodology
283
Developing Countries
255
Studies
251
Developed Countries
210
Research Report
206
Adolescents
202
Americas
182
Diseases
181
Comparative Studies
177
Population Dynamics
172
Health
168
North America
159
Biology
157
Research Support, Non-U.S. Gov't
146
Behavior
139
Northern America
139
Child
133
United States
132
Physiology
126
Adolescents, Female
122
Infant
115
Fertility
103
Family Planning
102
Africa
94
Economic Factors
92
Reproductive Behavior
87
Delivery Of Health Care
86
Africa South Of The Sahara
84
Asia
82
Nutrition
82
Contraception
81
Adolescent Pregnancy
79
Socioeconomic Factors
78
Psychological Factors
77
Sex Behavior
68
Family And Household
67
Measurement
67
Health Services
66
Education
65
Family Characteristics
64
Europe
63
Reproduction
63
English Speaking Africa
62
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