1 Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Korea Veterans Health Service, Busan Veterans Hospital, Baekyang-daero, Busan, 42046996, Korea.
2 Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Korea Veterans Health Service, Busan Veterans Hospital, Baekyang-daero, Busan, 42046996, Korea. dhugie@naver.com.
3 Division of Cardiology, Department of Internal Medicine, Ulsan Medical Center, Ulsan, Korea.