Clinical Engineering Department, Kawashima Hospital, 1-39 Kitasakoichiban-cho, Tokushima, 770-0011, Japan. Department of Kidney Disease, Kawashima Hospital, 1-39 Kitasakoichiban-cho, Tokushima, 770-0011, Japan. h.shima@khg.or.jp. Wakimachi Kawashima Clinic, 39-2 wakimachi ooaza inoshiritatejinnjya shimominami, Mima-shi, Tokushima, 779-3602, Japan. Department of Laboratory, Kawashima Hospital, 1-39 Kitasakoichiban-cho, Tokushima, 770-0011, Japan. Department of Kidney Disease, Kawashima Hospital, 1-39 Kitasakoichiban-cho, Tokushima, 770-0011, Japan.