[1] Univ Pittsburgh, Med Ctr, Pittsburgh, PA USA
[2] Univ Pittsburgh, Canc Inst, Pittsburgh, PA USA
[3] Ohio State Univ, Columbus, OH 43210 USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Thorac Head & Neck Med Oncol, Div Canc Med, Houston, TX 77030 USA
[5] Royal Marsden Natl Inst Hlth Res Biomed Res Ctr, Inst Canc Res, London, England
[6] Ctr Leon Berard, Lyon, France
[7] Stanford Canc Inst, Stanford, CA USA
[8] Fdn Ist Ricovero Cura Carattere Sci, Ist Nazl Tumori, Milan, Italy
[9] Univ Hosp Essen, Essen, Germany
[10] Inst Gustave Roussy, Villejuif, France
[11] Univ Michigan, Ann Arbor, MI USA
[12] Winship Canc Inst, Atlanta, GA USA
[13] Dana Farber Canc Inst, Boston, MA 02115 USA
[14] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[15] Aichi Canc Ctr Hosp, Nagoya, Aichi, Japan
[16] Natl Cheng Kung Univ NCKU Hosp, Tainan, Taiwan
[17] Bristol Myers Squibb, Princeton, NJ USA
[18] Univ Chicago, Chicago, IL 60637 USA