1 Department of General Internal Medicine, Kawasaki Municipal Tama Hospital, Kawasaki, Kanagawa, Japan; Department of General Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan. Electronic address: ai.yokoi@marianna-u.ac.jp.
2 Department of General Medicine, Yokohama City University School of Medicine, Yokohama, Kanagawa, Japan.
3 Department of General Internal Medicine, Kawasaki Municipal Tama Hospital, Kawasaki, Kanagawa, Japan; Department of General Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan.
4 Department of Gastroenterological and General Surgery, Kawasaki Municipal Tama Hospital, Kawasaki, Kanagawa, Japan.