1. Department of Thoracic and Cardiovascular SurgeryAsan Medical Center, Ulsan University College of MedicineSeoul Republic of Korea
2. Department of Thoracic and Cardiovascular SurgerySamsung Medical Center, Sungkyunkwan University School of MedicineSeoul Republic of Korea
3. Department of Thoracic and Cardiovascular SurgerySeoul National University Hospital, Seoul National University College of MedicineSeoul Republic of Korea
4. Department of Thoracic and Cardiovascular SurgerySeverance Hospital, Yonsei University College of MedicineSeoul Republic of Korea