Department of Surgery;
Kepco Medical Foundation;
Hanil General Hospital;
#388-1 Ssangmoon-Dong;
Dobong-Gu;
Seoul 132-033;
South Korea;
Department of Surgery;
Samsung Medical Center;
College of Medicine;
Sungkyunkwan University;
#50 Irwon-Dong;
Gangnam-Gu;
Seoul 135-710;
South Korea;