title: Letter: Risk of respiratory-distress syndrome.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis; D001034:Apgar Score; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010713:Phosphatidylcholines / Q000032:analysis; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012127:Respiratory Distress Syndrome, Newborn / Q000175:diagnosis* / Q000453:epidemiology / Q000401:mortality; D013109:Sphingomyelins / Q000032:analysis
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins