1. Division of Cardiology, Department of Internal Medicine. St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan
2. Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Cardiac Center, Toyoko Hospital, Kawasaki, Kanagawa, Japan
3. Division of Cardiology, Department of Internal Medicine. St. Marianna University School of Medicine, Kawasaki Municipal Tama Hospital, Kawasaki, Kanagawa, Japan
4. Division of Cardiology, Department of Internal Medicine, St. Marianna University School of Medicine, Yokohama City Seibu Hospital, Yokohama, Kanagawa, Japan