1. Division of Nephrology, Department of Integrated Medicine, Saitama Medical Center, Jichi Medical University, Saitama, Japan
2. Department of Nephrology, Saitama Red-Cross Hospital, Saitama, Japan
3. Department of Clinical Engineering, Saitama Medical Center, Jichi Medical University, Saitama, Japan
4. Department of Nephrology, Morishita Memorial Hospital, Kanagawa, Japan