[1] Dana Farber Canc Inst, Boston, MA 02115 USA
[2] Johns Hopkins Univ, Sch Med, Johns Hopkins Oncol Ctr, Baltimore, MD 21205 USA
[3] Columbia Presbyterian Med Ctr, Herbert Irving Comprehens Canc Ctr, New York, NY 10032 USA
[4] N Essex Hlth Author, Witham, Essex, England
[5] Univ Utrecht Hosp, Utrecht, Netherlands
[6] Inst Med Informat, Leipzig, Germany
[7] Hosp Clin Barcelona, Barcelona, Spain
[8] Christie Hosp & Holt Radium Inst, Manchester M20 9BX, Lancs, England
[9] Ctr Hosp Lyon Sud, Lyon, France
[10] Med Klin & Poliklin, Kiel, Germany
[11] Oncol Clin, Brussels, Belgium
[12] Univ Nebraska, Med Ctr, Omaha, NE USA
[13] Ctr Leon Berard, F-69373 Lyon, France