The delivery of childbirth reports: an analysis of sample bias in questionnaire returns.
D000488:Allied Health Personnel; D001291:Attitude of Health Personnel; D003258:Consumer Behavior; D005260:Female; D006801:Humans; D007745:Labor Onset; D007747:Labor Stage, First; D007748:Labor Stage, Second; D007743:Labor, Obstetric; D008297:Male; D009774:Obstetrics; D010146:Pain / Q000209:etiology; D010290:Parents; D010298:Parity; D011247:Pregnancy; D011795:Surveys and Questionnaires