Yoichi Iwafuchi1, Ken-Ichi Kano2, Ichiei Narita3. 1. Department of Internal Medicine, Koseiren Sanjo General Hospital, 5-1-62 Tsukanome, Sanjo, 955-0055, Japan. iwafuchiy@hotmail.com. 2. Department of Internal Medicine, Koseiren Sanjo General Hospital, 5-1-62 Tsukanome, Sanjo, 955-0055, Japan. 3. Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-Dori, Chuo-ku, Niigata, 951-8510, Japan.