[1] Clin Univ Navarra, Idisna, Pamplona, Spain
[2] Ciberehd, Madrid, Spain
[3] Natl Taiwan Univ Hosp, Taipei, Taiwan
[4] Univ Ulsan, Asan Med Ctr, Ulsan, South Korea
[5] Seoul Natl Univ, Seoul, South Korea
[6] USC Norris Comprehens Canc Ctr, Los Angeles, CA USA
[7] Humanitas Univ, Humanitas Clin & Res Ctr, Rozzano, Italy
[8] Univ Navarra, Pamplona, Spain
[9] Kindai Univ, Dept Gastroenterol & Hepatol, Fac Med, Higashiosaka, Osaka, Japan
[10] Chang Gung Mem Hosp, Taipei, Taiwan
[11] Hosp Gen Univ Gregorio Maranon, Serv Digest, Madrid, Spain
[12] Univ Bologna, Dept Med & Surg Sci, Bologna, Italy
[13] Princess Margaret Canc Ctr, Toronto, ON, Canada
[14] Georgetown Univ Hosp, Washington, DC 20007 USA
[15] Emory Univ, Winship Canc Inst, Atlanta, GA 30322 USA
[16] Fdn Invest, San Juan, PR USA
[17] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Seoul, South Korea
[18] Bristol Myers Squibb, New York, NY USA
[19] Univ Hong Kong, Hong Kong, Peoples R China