title: Lecithin-spingomyelin ratio in eight cases of premature rupture of the membranes.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005322:Premature Rupture of Fetal Membranes; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007745:Labor Onset; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D012127:Respiratory Distress Syndrome, Newborn / Q000517:prevention & control*; D012312:Ritodrine / Q000627:therapeutic use; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins; D012312:Ritodrine