1. Department of Vascular Surgery, Saiseikai Yahata General Hospital, Kitakyushu, Japan
2. Department of Vascular Surgery, Kyushu Central Hospital, Fukuoka, Japan
3. Department of Vascular Surgery, Steel Memorial Yawata Hospital, Kitakyushu, Japan
4. Department of Vascular Surgery, Kokura Memorial Hospital, Kitakyushu, Japan