Locked twins.
D000328:Adult; D000367:Age Factors; D000653:Amniotic Fluid; D001724:Birth Weight; D004841:Episiotomy; D005113:Extraction, Obstetrical; D005260:Female; D005313:Fetal Death; D006801:Humans; D007746:Labor Presentation; D008423:Maternal Age; D008428:Maternal Mortality; D009119:Muscle Contraction; D009129:Muscle Tonus; D007744:Obstetric Labor Complications / Q000209:etiology; D010298:Parity; D011247:Pregnancy; D011248:Pregnancy Complications; D014427:Twins; D014599:Uterus / Q000502:physiology