Thema
Journal Article
4.239
Data Collection
2.747
Data collection
2.492
Research Methodology
2.248
Population
1.496
Demographic Factors
1.348
Studies
1.233
data collection
1.218
Developing Countries
1.209
Developed Countries
924
Population Dynamics
919
Population Characteristics
834
Research Support, Non-U.S. Gov't
822
Family Planning
732
Diseases
684
Measurement
626
Americas
615
Behavior
608
Economic Factors
563
Health
538
Mortality
535
Age Factors
514
North America
514
Contraception
488
Asia
482
Biology
481
Data Analysis
480
Interviews
464
Population Statistics
448
Evaluation
405
Europe
404
Northern America
400
Socioeconomic Factors
382
Africa
379
United States
375
Fertility
364
Organization And Administration
364
Surveys
364
Physiology
360
Delivery Of Health Care
347
Sampling Studies
341
English Abstract
326
Patients
307
Data Sources
301
Reproduction
299
Comparative Study
296
Africa South Of The Sahara
287
Programs
275
Census
271
Research Report
265
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