Thema
Comparative Study
Journal Article
2.378
Contraceptive Agents, Female
974
Family Planning
778
Research Support, Non-U.S. Gov't
711
Research Methodology
710
Contraception
641
Biology
570
Fertility Agents, Female
558
Physiology
554
Studies
510
Randomized Controlled Trial
465
Comparative Studies
411
Klinische Studie
398
Levonorgestrel
394
Contraceptive Agents
377
5W7SIA7YZW
369
Population
309
Demographic Factors
307
Developed Countries
305
Diseases
305
Clinical Research
296
Urogenital System
287
Genitalia
282
Genitalia, Female
279
Age Factors
267
Contraceptive Methods
258
Population Characteristics
252
Reproduction
248
Endocrine System
247
Research Report
246
Hormones
245
Contraceptives, Oral
241
Estradiol
236
4TI98Z838E
228
Contraceptive Agents, Progestin
228
Developing Countries
227
Ethinyl Estradiol
215
Population Dynamics
213
Examinations And Diagnoses
209
1HRS458QU2
206
Clomiphene
206
Contraceptives, Oral, Combined
203
Americas
202
Medroxyprogesterone Acetate
195
Uterus
190
Progesterone
189
423D2T571U
187
North America
182
C2QI4IOI2G
180
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