1. Division of Nephrology, Hypertension and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, 30-1, Oyaguchi Kami-chou, Itabashi-ku, Tokyo, 173-8610, Japan ; ;
2. Department of Internal Medicine, Nihon University Nerima Hikarigaoka Hospital, Tokyo, Japan
3. Division of General Medicine, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan