[1] Yonsei Univ, Coll Med, Dept Internal Med, Seoul 120752, South Korea
[2] Yonsei Univ, Coll Med, Dept Radiat Oncol, Seoul 120752, South Korea
[3] Catholic Univ Korea, Coll Med, Dept Internal Med, Seoul, South Korea
[4] Seoul Natl Univ, Coll Med, Dept Radiol, Seoul, South Korea
[5] Seoul Natl Univ, Coll Med, Inst Radiat Med, Seoul, South Korea
[6] Natl Canc Ctr, Res Inst & Hosp, Ctr Liver Canc, Goyang Si, South Korea
[7] Kinki Univ, Sch Med, Dept Gastroenterol & Hepatol, Osaka 589, Japan
[8] Juntendo Univ, Hosp Shizuoka, Shizuoka, Japan
[9] Zhongshan Hosp, Shanghai, Peoples R China
[10] Univ Hong Kong, Queen Mary Hosp, Dept Surg, Hong Kong, Hong Kong, Peoples R China
[11] Singapore Gen Hosp, Dept Gen Surg, Singapore 0316, Singapore
[12] Natl Taiwan Univ Hosp, Dept Oncol, Taipei, Taiwan