vitamin d deficiency and high serum levels of vitamin a increase the risk of osteoporosis evaluated by quantitative ultrasound measurements (qus) in postmenopausal spanish women：缺乏维生素d..

vitamin d deficiency and high serum levels of vitamin a increase the risk of osteoporosis evaluated by quantitative ultrasound measurements (qus) in postmenopausal spanish women：缺乏维生素d和维生素a增加骨质疏松的风险的定量超声测定血清高水平（qus）在西班牙绝经后妇女