Twins as markers of the value of obstetric radiography.
D001720:Birth Injuries / Q000401:mortality; D001724:Birth Weight; D006259:Craniocerebral Trauma / Q000401:mortality; D005260:Female; D005313:Fetal Death; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000401:mortality; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging*; D011272:Pregnancy, Multiple; D001261:Pulmonary Atelectasis / Q000401:mortality; D011859:Radiography; D014427:Twins