title: Comparison of methods to estimate fetal lung maturity.
mesh_terms: D005260:Female; D005325:Fetal Organ Maturity; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000196:embryology*; D010713:Phosphatidylcholines / Q000097:blood*; D011247:Pregnancy; D011446:Prospective Studies; D012127:Respiratory Distress Syndrome, Newborn / Q000209:etiology; D013109:Sphingomyelins / Q000097:blood*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins; C017463:lecithins, disaturated