Calcium plus vitamin D supplementation has limited effects on femoral geometric strength in older postmenopausal women: the Women's Health Initiative.
Jackson RD, Wright NC, Beck TJ, Sherrill D, Cauley JA, Lewis CE, LaCroix AZ, LeBoff MS, Going S, Bassford T, Chen Z. Calcium plus vitamin D supplementation has limited effects on femoral geometric strength in older postmenopausal women: the Women's Health Initiative. Calcif Tissue Int. 2011 Mar; 88(3):198-208.