1 Department of General Internal Medicine, Eastern Chiba Medical Center, Togane, Japan; Department of General Medicine, Chiba University Hospital, Japan. Electronic address: aaagetzsail@gmail.com.
2 Department of General Medicine, Yokohama City University School of Medicine, Japan.
3 Department of General Medicine, International University of Health and Welfare Narita Hospital, Chiba, Japan.
4 Department of General Internal Medicine, Eastern Chiba Medical Center, Togane, Japan.
5 Department of General Medicine, Chiba University Hospital, Japan.