[1] Catholic Univ Korea, Eunpyeong St Marys Hosp, Coll Med, Dept Thorac & Cardiovasc Surg, Eunpyeong St, Seoul 03312, South Korea
[2] Catholic Univ Korea, Eunpyeong St Marys Hosp, Coll Med, Thorac & Cardiovasc Surg, 1021 Tongil Ro, Seoul 03312, South Korea