1 Department of Internal Medicine, Teikyo University School of Medicine, Tokyo, and Department of Rheumatology, Nobuhara Hospital, Hyogo, Japan. shunsei_tenpoint@yahoo.co.jp.
2 Department of Internal Medicine, Teikyo University School of Medicine, Tokyo, Japan.
3 Department of Surgery, Shiraoka Central General Hospital, Saitama, Japan.
4 Department of Pathology, Tohoku University School of Medicine, Sendai, Japan.