Thema
Prospective Studies
Journal Article
1.169
Studies
1.021
Research Methodology
969
Family Planning
562
Biology
556
Diseases
552
Developing Countries
485
Population
483
Demographic Factors
477
Physiology
471
Contraception
391
Research Report
358
Population Characteristics
332
Research Support, Non-U.S. Gov't
325
Developed Countries
317
Population Dynamics
317
Age Factors
293
Reproduction
284
Examinations And Diagnoses
232
Americas
228
Health
224
Africa
199
North America
199
Treatment
196
Measurement
194
Asia
183
Comparative Study
182
Africa South Of The Sahara
175
Klinische Studie
170
Behavior
169
Pregnancy
165
Contraceptive Methods
162
Northern America
156
Laboratory Examinations And Diagnoses
149
Infections
148
Mortality
146
Europe
145
United States
144
Risk Factors
140
Contraceptives, Oral
139
Fertility
137
Youth
129
Viral Diseases
127
Contraceptive Agents, Female
124
Endocrine System
124
Research Support, U.S. Gov't, P.H.S.
120
Nutrition
118
Comparative Studies
115
Clinical Research
113
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