[1] Yonsei Univ, Coll Med, Yonsei Inst Gastroenterol,Hlth Serv, Dept Radiat Oncol,Yonsei Liver Canc Special Clin, Seoul 120752, South Korea
[2] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Radiat Oncol, Seoul, South Korea
[3] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Med, Seoul, South Korea
[4] Catholic Univ Korea, Coll Med, Dept Internal Med, Seoul, South Korea
[5] Kyungpook Natl Univ, Sch Med, Dept Internal Med, Div Gastroenterol & Hepatol, Taegu, South Korea
[6] Kurume Univ, Sch Med, Div Gastroenterol, Dept Med, Kurume, Fukuoka 830, Japan
[7] Fudan Univ, Zhongshan Hosp, Dept Radiat Oncol, Shanghai 200433, Peoples R China
[8] Zhengzhou Univ, Dept Intervent Radiol, Affiliated Hosp 1, Zhengzhou, Peoples R China