1. Department of Surgery, Saiwaicho Memorial Hospital, Okayama, Japan
2. Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University of Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
3. Department of Dialysis Access Center, Shigei Medical Research Hospital, Okayama, Japan
4. Department of Internal Medicine, Saiwaicho Memorial Hospital, Okayama, Japan