Affiliation: | 1. Department of Biostatistics, School of Public Health, The University of Tokyo, Tokyo, Japan 2. Public Health Research Foundation, Tokyo, Japan 3. Japan Osteoporosis Foundation, Tokyo, Japan 4. Department of Internal Medicine, Research Institute and Practice for Involutional Diseases, Nagano, Japan 5. National Center for Global Health and Medicine, Tokyo, Japan 6. Bone and Joint Surgery, Seirei Hamamatsu General Hospital, 2-12-12 Sumiyoshi, Naka-ku, Hamamatsu, Shizuoka, 430-8558, Japan
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