1. Division of General Medicine, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Saitama City, Saitama, Japan
2. Division of Nephrology, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Saitama City, Saitama, Japan
3. Department of Pathology, Saitama Medical Center, Jichi Medical University, Saitama City, Saitama, Japan
4. Division of Community Medicine and Career Development, Kobe University, The Graduate School of Medicine, Kobe, Hyogo, Japan