Regionalization of obstetric services: problems and opportunities.
D001294:Attitude to Health; D002140:California; D003153:Community Health Services; D036861:Delivery, Obstetric; D003710:Demography; D005260:Female; D006748:Hospital Departments; D006764:Hospitals, Community; D006771:Hospitals, Maternity; D006801:Humans; D008800:Mexico / Q000208:ethnology; D009774:Obstetrics; D010820:Physicians; D011247:Pregnancy; D012040:Regional Health Planning; D012041:Regional Medical Programs; D012111:Residence Characteristics; D011795:Surveys and Questionnaires