Hirofumi Nishikawa1, Yoshinori Taniguchi2. 1. Department of Endocrinology, Metabolism, Nephrology and Rheumatology, Kochi Medical School Hospital, Nankoku, Kochi, Japan. 2. Department of Endocrinology, Metabolism, Nephrology and Rheumatology, Kochi Medical School Hospital, Nankoku, Kochi, Japan. yoshii.tan@gmail.com.