title: [Characteristics of cholelithiasis in Beijing: infrared spectrum analysis of 772 cases of cholelithiasis].
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001663:Bilirubin / Q000032:analysis; D002118:Calcium / Q000032:analysis; D002681:China; D002769:Cholelithiasis / Q000453:epidemiology / Q000378:metabolism*; D002784:Cholesterol / Q000032:analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D013055:Spectrophotometry, Infrared
chemical_list: D002784:Cholesterol; D001663:Bilirubin; D002118:Calcium