1. Department of Internal Medicine, Division of Kidney and Dialysis, Kansai Rosai Hospital, Amagasaki, Japan
2. Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
3. Vascular Access Center, Yokohama Daiichi Hospital, Yokohama, Japan
4. Department of Vascular Surgery and Internal Medicine, Division of Nephrology, Rakuwakai Otowa Memorial Hospital, Kyoto, Japan