title: Foetal lung maturation in twin gestation.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005325:Fetal Organ Maturity; D006801:Humans; D008168:Lung / Q000196:embryology*; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D013109:Sphingomyelins / Q000032:analysis*; D014427:Twins
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins