Pre-screening for osteoporosis with calcaneus quantitative ultrasound and dual-energy X-ray absorptiometry bone density oleh Chia-Chi Yen, Wei-Chun Lin, Tzu-Hao Wang, Guan-Fan Chen, Da-Ying Chou, Dian-Min Lin, Shu-Yuan Lin, Min-Ho Chan, Jia-Ming Wu, Chin-Dar Tseng, Yu-Jie Huang, Tsair-Fwu Lee