[1] Pusan Natl Univ, Dept Surg, Yangsan Hosp, Yangsan 50612, Gyeongsangnam D, South Korea
[2] Pusan Natl Univ, Res Inst Convergence Biomed Sci & Technol, Yangsan Hosp, Yangsan 50612, Gyeongsangnam D, South Korea
[3] Pusan Natl Univ, Dept Internal Med, Yangsan Hosp, Yangsan, South Korea
[4] Pusan Natl Univ, Dept Surg, Pusan, South Korea