title: Reversed serum lecithin: cholesterol ratios in relation to gallstone formation as a possible aid to diagnosis.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002769:Cholelithiasis / Q000097:blood / Q000175:diagnosis*; D002784:Cholesterol / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010713:Phosphatidylcholines / Q000097:blood*
chemical_list: D010713:Phosphatidylcholines; D002784:Cholesterol