[1] Kyushu Univ, Fac Med, Dept Med Informat, Higashi Ku, Fukuoka 8128582, Japan
[2] Kyushu Univ, Fac Med, Dept Endoscop Diagnost & Therapeut, Fukuoka 812, Japan
[3] Kyushu Univ, Comp & Commun Ctr, Fukuoka 812, Japan
[4] Hanyang Univ, Coll Med, Dept Med, Seoul 133791, South Korea
[5] Seoul Natl Univ, Bundang Hosp, Dept Surg, Seoul, South Korea
[6] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Oncol, Fukuoka, Japan
[7] Stanford Univ, Med Media & Informat Technol, Palo Alto, CA 94304 USA
[8] Natl Canc Ctr, Res Inst & Hosp, Goyang, Gyeonggi, South Korea