Effect of estrogen on calcium absorption and serum vitamin D metabolites in postmenopausal osteoporosis.
J Clin Endocrinol Metab. 1980 Dec;51(6):1359-64. doi: 10.1210/jcem-51-6-1359.
J Clin Endocrinol Metab. 1980.
PMID: 6255005
Clinical Trial.