1. Department of Medicine (Cardiology, General Medicine), Tokai University School of Medicine , 143 Shimokasuya, Isehara 259-1193 , Japan
2. General Clinical Research Center, Division of Cardiology, Taipei Veterans General Hospital and National Yang Ming Chiao Tung University , Taipei , Taiwan
3. Department of Cardiology, Korea University Anam Hospital , Seoul , Korea
4. Department of Critical Care Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, and National Yang Ming Chiao Tung University , Taipei , Taiwan
5. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore , Singapore
6. Department of Cardiology, Tenyoukai Central Hospital , Kagoshima , Japan