The problem of osteoporosis.
D002118:Calcium / Q000652:urine; D002136:Calcium, Dietary; D006801:Humans; D008297:Male; D008875:Middle Aged; D010024:Osteoporosis / Q000628:therapy*; D005082:Physical Exertion; D011379:Prognosis
D002136:Calcium, Dietary; D002118:Calcium