1. College of Science and Technology, Nihon University; 1-8-1 Kanda-Surugadai; Chiyoda-ku, Tokyo; 101-8308; Japan
2. Department of Thoracic and Cardiac Surgery; Sapporo Medical University; South 1 West 16; Chuo-ku, Sapporo; 060-8543; Japan
3. Faculty of Engineering; Ibaraki University; 4-12-1 Nakanarusawa-chyou; Hitachi-shi, Ibaraki; 306-8511; Japan