title: Progressive decrease of true intestinal calcium absorption with age in normal man.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002118:Calcium / Q000378:metabolism*; D002132:Calcium Radioisotopes; D002648:Child; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D012737:Sex Factors
chemical_list: D002132:Calcium Radioisotopes; D002118:Calcium