[1] Yonsei Univ, Severance Hosp, Coll Med, Dept Surg,Div Hepatobiliary Pancreas Surg, Seoul, South Korea
[2] Samyang Biopharmaceut Corp, Clin & Regulatory Affairs Team, Gyeonggi, South Korea
[3] Korea Univ, Guro Hosp, Coll Med, Dept Thorac & Cardiovasc Surg, Seoul, South Korea
[4] Inje Univ, Haeundae Paik Hosp, Coll Med, Dept Surg, Pusan, South Korea
[5] Kangdong Sacred Heart Hosp, Dept Neurosurg, Seoul, South Korea
[6] Soonchunhyang Univ, Seoul Hosp, Dept Surg, Seoul, South Korea
[7] Seoul Natl Univ, Seoul Natl Univ Hosp, Coll Med, Dept Obstet & Gynecol, Seoul, South Korea
[8] Korea Univ, Guro Hosp, Coll Med, Dept HBP Surg, Seoul, South Korea
[9] Korea Univ, Ansan Hosp, Dept Orthoped Surg, Med Ctr,Spine Div, Ansan, South Korea
[10] Yonsei Univ, Coll Med, Dept Surg, Ludlow Fac Res Bldg, 50-1 Yonsei ro, Seoul 03722, South Korea