Umihiko Kaneko1, Daisuke Hachinohe2, Ken Kobayashi2, Tsutomu Fujita2. 1. Department of Cardiovascular Medicine, Sapporo Cardio Vascular Clinic, Sapporo Heart Center, Sapporo, Japan. uk434471@gmail.com. 2. Department of Cardiovascular Medicine, Sapporo Cardio Vascular Clinic, Sapporo Heart Center, Sapporo, Japan.