title: [The effects of oral doses of 1, 25-dihydroxyvitamin D3 and 1 alpha-hydroxyvitamin D3 on intestinal calcium absorption and serum 1, 25-dihydroxyvitamin D level: a study in healthy adults and in postmenopausal osteoporosis].
mesh_terms: D000284:Administration, Oral; D000328:Adult; D002117:Calcitriol / Q000008:administration & dosage* / Q000097:blood; D002118:Calcium / Q000378:metabolism*; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D008297:Male; D008593:Menopause; D008875:Middle Aged; D010024:Osteoporosis / Q000378:metabolism*
chemical_list: D002117:Calcitriol; D002118:Calcium