1. Department of Thoracic and Cardiovascular Surgery, Pusan National University Hospital, Medical Research Institution, Busan, Republic of Korea
2. Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hwasun Hospital, Jeonnam, Republic of Korea
3. Department of Thoracic and Cardiovascular Surgery, Ulsan University Hospital, Ulsan, Republic of Korea
4. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Jeonnam, Republic of Korea