[1] Univ Milan, Monza, Italy
[2] MD Anderson Canc Ctr, Houston, TX USA
[3] St Petersburg Pavlov State Med Univ, St Petersburg, Russia
[4] Hosp Britanico, Buenos Aires, DF, Argentina
[5] Hosp Rebagliati, Lima, Peru
[6] Emory Univ, Winship Canc Inst, Atlanta, GA 30322 USA
[7] Wyeth, Pfizer, Paris, France
[8] Pfizer, Collegeville, PA USA
[9] Univ Klinikum Aachen, Aachen, Germany