Nielsen TF.Ravn P.Bagger YZ Pulsed estrogen therapy in prevention of postmenopausal osteoporosis.A 2-year randomized,double blind,placebo-controlled study 2004(2是什么意思_Nielsen TF.Ravn P.Bagger YZ Pulsed estrogen therapy in prevention of postmenopausal osteoporosis.A 2-year randomized,double blind,placebo-controlled study 2004(2在线翻译_英语_读音_用法_例句