1. Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, South Korea
2. Myongji Hospital, Hanyang University College of Medicine, Goyang, South Korea
3. Wonkwang University Hospital, Iksan, South Korea
4. Kangwon National University School of Medicine, Chuncheon, South Korea
5. Dankook University Hospital, Dankook University College of Medicine, Cheonan, South Korea
6. National Health Insurance Service Ilsan Hospital, Goyang-City, South Korea
7. Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, South Korea
8. Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, South Korea
9. Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
10. Department of Preventive Medicine and Biostatistics, Yonsei University College of Medicine, Seoul, South Korea