title: Clinical usefulness of the lecithin/sphingomyelin ratio determined by visual means in predicting hyaline membrane disease.
mesh_terms: D000649:Amniocentesis; D003720:Densitometry; D005260:Female; D006801:Humans; D006819:Hyaline Membrane Disease / Q000175:diagnosis*; D007231:Infant, Newborn; D008722:Methods; D010713:Phosphatidylcholines / Q000032:analysis; D011247:Pregnancy; D013109:Sphingomyelins / Q000032:analysis
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins