1 Department of Cardiovascular Surgery, Juntendo University Hospital, Tokyo, Japan.
2 Department of General Medicine, Faculty of Medicine, Juntendo University, Tokyo, Japan.. Electronic address: [email protected].
3 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.
4 Department of General Medicine, Faculty of Medicine, Juntendo University, Tokyo, Japan.