1. Division of Cardiology, Department of Internal Medicine, Iwate Medical University Hospital, Japan
2. Department of Cardiology, Iwate Prefectural Chubu Hospital, Japan
3. Department of Cardiology, Hachinohe Red Cross Hospital, Japan
4. Department of Cardiology, Iwate Prefectural Kuji Hospital, Japan
5. Department of Cardiology, Iwate Prefectural Ofunato Hospital, Japan
6. Department of Cardiology, Iwate Prefectural Miyako Hospital, Japan