Thema
Journal Article
4.519
Prospective study
2.515
prospective study
1.482
Research Support, Non-U.S. Gov't
1.459
Prospective Studies
1.324
Prospective studies
1.153
Studies
1.028
Research Methodology
969
prospective studies
858
Diseases
600
Biology
593
Family Planning
562
Developing Countries
485
Physiology
485
Population
485
Demographic Factors
477
Contraception
391
Research Report
358
Population Characteristics
332
Multicenter Study
331
Developed Countries
317
Population Dynamics
317
Research Support, N.I.H., Extramural
316
Comparative Study
302
Mortality
296
Reproduction
295
Age Factors
293
Observational Study
256
Klinische Studie
246
Randomized Controlled Trial
238
Examinations And Diagnoses
232
Health
232
Americas
228
Pregnancy
217
Medicine
214
Africa
209
R
202
Treatment
201
North America
199
Biomarkers
197
Measurement
194
Asia
193
Epidemiology
191
Behavior
176
Africa South Of The Sahara
175
Incidence
167
Contraceptive Methods
162
Review
158
Northern America
156
Infections
154
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