title: Roentgenologic pulmonary findings and lecithin-sphingomyelin ratio in idiopathic respiratory distress syndrome of various degrees of severity.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000000981:diagnostic imaging*; D010713:Phosphatidylcholines / Q000032:analysis; D011247:Pregnancy; D011859:Radiography; D012127:Respiratory Distress Syndrome, Newborn / Q000000981:diagnostic imaging*; D013109:Sphingomyelins / Q000032:analysis
chemical_list: D010713:Phosphatidylcholines; D013109:Sphingomyelins