Thema
610
7.895
Phase: Retrospective study
7.862
Study Type: Observational
5.809
Journal Article
4.697
Recruitment Status: Recruiting
3.692
Recruitment Status: Not yet recruiting
2.895
Retrospective Study
2.338
Retrospective study
2.212
retrospective study
1.683
Retrospective Studies
1.403
Recruitment Status: Completed
1.288
Public Health
1.230
Retrospective studies
1.139
Studies
926
retrospective studies
925
Research Methodology
875
Research Support, Non-U.S. Gov't
678
Study Type: Diagnostic test
578
Population
537
Demographic Factors
526
Diseases
516
Study Type: Relative factors research
498
Family Planning
459
Developing Countries
439
Patient Outcome
413
Biology
367
Population Dynamics
366
Population Characteristics
363
Research Report
326
Developed Countries
308
Age Factors
304
Physiology
293
Medical Condition: Novel Coronavirus Pneumonia (COVID-19)
266
Congenital Anomaly
264
Contraception
260
Medicine & Public Health
245
Mortality
245
Comparative Study
244
Study Type: Basic Science
242
医药卫生科技
236
医药、卫生
232
Medicine
227
Reproduction
225
R
215
Americas
211
Multicenter Study
203
Health
202
Surgery
201
Pregnancy
200
Observational Study
199
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