Thema
610
7.883
Phase: Retrospective study
7.850
Study Type: Observational
5.797
Journal Article
4.498
Recruitment Status: Recruiting
3.686
Recruitment Status: Not yet recruiting
2.891
Retrospective Study
2.335
Retrospective study
2.041
retrospective study
1.601
Recruitment Status: Completed
1.286
Retrospective Studies
1.284
Public Health
1.232
Retrospective studies
944
retrospective studies
870
Studies
825
Research Methodology
777
Research Support, Non-U.S. Gov't
673
Study Type: Diagnostic test
578
Study Type: Relative factors research
498
Population
484
Demographic Factors
474
Diseases
467
Patient Outcome
413
Family Planning
408
Developing Countries
391
Biology
336
Population Dynamics
328
Population Characteristics
324
Research Report
301
Developed Countries
278
Age Factors
274
Physiology
267
Medical Condition: Novel Coronavirus Pneumonia (COVID-19)
266
Congenital Anomaly
264
Study Type: Basic Science
242
Comparative Study
234
Contraception
234
Mortality
226
Medicine
212
Multicenter Study
203
Reproduction
202
R
200
Observational Study
195
Health
188
Pregnancy
187
Study Type: Prognosis study
184
Americas
183
Asia
176
Measurement
174
United States
171
mehr ...