[1] Kobe Univ, Grad Sch Med, Dept Pathol, Div Pathol, Kobe 6500017, Japan
[2] Kobe Univ, Dept Surg Related, Div Obstet & Gynecol, Grad Sch Med, Kobe 6500017, Japan
[3] Kobe Univ, Grad Sch Med, Dept Internal Med, Div Gastroenterol, Kobe 6500017, Japan
[4] Kobe Univ, Grad Sch Med, Dept Surg, Div Hepatobiliary Pancreat Surg, Kobe 6500017, Japan
[5] Kobe Univ, Dept Surg, Div Gastrointestinal Surg, Grad Sch Med, Kobe 6500017, Japan