1 The Second Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahatanishi, Kitakyushu, Japan.
2 Department of Anatomy, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahatanishi, Kitakyushu, Japan.
3 The Second Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahatanishi, Kitakyushu, Japan. tetsum@med.uoeh-u.ac.jp.
4 Kidney Center, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahatanishi, Kitakyushu, Japan.