[1] Catholic Univ Korea, Yeouido St Marys Hosp, Coll Med, Dept Surg, Seoul, South Korea
[2] Seoul Natl Univ, Boramae Hosp, Coll Med, Dept Surg, 20 Boramae Ro 5 Gil, Seoul 156707, South Korea
[3] Seoul Natl Univ, Bundang Hosp, Coll Med, Dept Surg, 20 Boramae Ro 5 Gil, Seoul 156707, South Korea