Maternal and child health in the developing countries: problems of data collection.
D000328:Adult; D000368:Aged; D002648:Child; D002662:Child Health Services / Q000592:standards*; D002675:Child, Preschool; D003625:Data Collection / Q000379:methods*; D003906:Developing Countries; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008427:Maternal Health Services / Q000592:standards*; D011247:Pregnancy; D012189:Retrospective Studies; D011795:Surveys and Questionnaires