[1] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Oncol, 88,Olymp Ro 43 Gil, Seoul 05505, South Korea
[2] Pusan Natl Univ, Yangsan Hosp, Div Hematol & Oncol, Yangsan 50612, South Korea
[3] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Thorac & Cardiovasc Surg, Seoul 05505, South Korea
[4] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Radiat Oncol, Seoul 05505, South Korea