1. Department of Cardiology, Tenshi Hospital, 1-1 North-12 East-3, Higashi-ku, Sapporo, Hokkaido, 0658611, Japan
2. Division of Nephrology, Department of Internal Medicine, Showa University Northern Yokohama Hospital, 35-1, Chigasakichuo, Tsuzuki-ku, Yokohama, 2248503, Japan