1. Department of Cardiovascular Medicine, Shin-Yurigaoka General Hospital, 255 Furusawatsuko, Asao-Ward, Kawasaki City, Kanagawa 180-8610, Japan
2. Department of Cardiovascular Surgery, Shin-Yurigaoka General Hospital, 255 Furusawatsuko, Asao-Ward, Kawasaki City, Kanagawa 180-8610, Japan