1. Division of Nephrology and Endocrinology, The University of Tokyo Hospital, Tokyo 113-8655, Japan
2. Osteoporosis Center, The University of Tokyo Hospital, Tokyo 113-8655, Japan
3. Department of Respiratory Medicine, The University of Tokyo Hospital, Tokyo 113-8655, Japan
4. Department of Pathology, Graduate School of Medicine, The University of Tokyo Hospital, Tokyo 113-8655, Japan