1. Department of Cardiology; Saga-ken Medical Centre Koseikan; Saga Japan
2. EP Expert Doctors-Team Tsuchiya; Kumamoto Japan
3. Department of Cardiology; Dokkyo Medical University Koshigaya Hospital; Koshigaya Japan
4. Department of Statistics; Aichi Medical University; Nagakute Japan
5. Department of Cardiology and Clinical Examination; Faculty of Medicine; Oita University; Yufu Japan