Thema
Journal Article
4.480
Prospective study
2.491
Research Support, Non-U.S. Gov't
1.453
prospective study
1.435
Prospective Studies
1.320
Prospective studies
1.131
Studies
1.028
Research Methodology
969
prospective studies
843
Diseases
600
Biology
593
Family Planning
562
Developing Countries
485
Physiology
485
Population
485
Demographic Factors
477
Contraception
391
Research Report
358
Multicenter Study
332
Population Characteristics
332
Developed Countries
317
Population Dynamics
317
Research Support, N.I.H., Extramural
315
Comparative Study
302
Mortality
296
Reproduction
295
Age Factors
293
Observational Study
254
Klinische Studie
246
Randomized Controlled Trial
236
Examinations And Diagnoses
232
Health
231
Americas
228
Pregnancy
216
Africa
209
Treatment
201
North America
199
Biomarkers
195
Measurement
194
Asia
193
Medicine
191
Epidemiology
190
R
179
Behavior
176
Africa South Of The Sahara
175
Incidence
166
Contraceptive Methods
162
Review
158
Northern America
156
Infections
154
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