1 Department of General Medicine, Yokohama City University School of Medicine, Yokohama, Kanagawa, Japan. Electronic address: e153068g@yokohama-cu.ac.jp.
2 Department of General Medicine, Yokohama City University School of Medicine, Yokohama, Kanagawa, Japan; Department of General Medicine, Yokohama City University Medical Center, Yokohama, Kanagawa, Japan.
3 Department of Internal Medicine, Yokosuka General Uwamachi Hospital, Yokosuka, Japan.
4 Department of General Internal Medicine, National Hospital Organization, Sagamihara National Hospital, Sagamihara, Japan.