1. Department of Radiologic Technology, Daegu Health College, Daegu 41453, Republic of Korea
2. Division of Cardiology, Department of Internal Medicine, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon 24341, Republic of Korea
3. Division of Cardiology, Department of Internal Medicine, Chunchoen Sacred Heart Hospital, Hallym University, Chuncheon 24253, Republic of Korea
4. Department of Research & Development Integrated Medical Technology Team, Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju 28160, Republic of Korea