1. Division of Nephrology and Hypertension, Saiseikai Yokohamashi Nanbu Hospital, Yokohama, Japan
2. Department of Internal Medicine, The Kobayashi Medical Clinic, Yokohama, Japan
3. Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
4. Center for Health Service Sciences, Yokohama National University, Yokohama, Japan
5. Department of Nephrology and Hypertension, Yokohama City University Medical Center, Yokohama, Japan
6. Department of Internal Medicine, Yokohama Rosai Hospital, Yokohama, Japan