[1] Mem Sloan Kettering Canc Ctr, New York, NY USA
[2] Weill Cornell Med Coll, New York, NY USA
[3] Johannes Gutenberg Univ Mainz, D-55131 Mainz, Germany
[4] Univ Texas MD Anderson Canc Ctr, Houston, TX USA
[5] Peking Univ Canc Hosp & Inst, Beijing, Peoples R China
[6] Pontificia Univ Catolica, Santiago, Chile
[7] Fdn Arturo Lopez Perez, Providencia, Chile
[8] Narodowy Inst Onkol, Klin Onkol & Radioterapii, Warsaw, Poland
[9] Canc Inst Hosp JFCR, Tokyo, Japan
[10] Dana Farber Canc Inst, Boston, MA USA
[11] Princess Margaret Canc Ctr, Toronto, ON, Canada
[12] Inst Nacl Cancerol ESE, Bogota, Colombia
[13] Laiko Gen Hosp Athens, Athens, Greece
[14] Med Univ Lublin, Klin Chirurgii Ogolnej Gastroenterol & Nowotworow, Lublin, Poland
[15] Fundacao Pio XII, Barretos, Brazil
[16] Fudan Univ, Zhongshan Hosp, Shanghai, Peoples R China
[17] Ctr Hosp Univ Montreal, Montreal, PQ, Canada
[18] Bristol Myers Squibb, Princeton, NJ USA
[19] Natl Canc Ctr Hosp East, Kashiwa, Japan