[1] Mem Sloan Kettering Canc Ctr, New York, NY 10021 USA
[2] Univ Birmingham, Div Canc Studies, Birmingham, W Midlands, England
[3] Princess Margaret Hosp, Toronto, ON M4X 1K9, Canada
[4] Unidad Oncol Neuquen, Neuquen, Argentina
[5] Hong Kong Sanatorium & Hosp, Hong Kong, Hong Kong, Peoples R China
[6] Bayer Schering Pharmaceut, Puteaux La Defense, France
[7] Bayer Schering Pharmaceut, Wuppertal, Germany