title: The challenge of osteoporosis.
mesh_terms: D002118:Calcium / Q000378:metabolism; D004967:Estrogens / Q000627:therapeutic use; D006801:Humans; D010024:Osteoporosis / Q000188:drug therapy / Q000378:metabolism / Q000503:physiopathology; D011187:Posture; D013131:Spine / Q000503:physiopathology
chemical_list: D004967:Estrogens; D002118:Calcium