[1] Univ Texas, MD Anderson Canc Ctr, Houston, TX 77030 USA
[2] Univ Studi Bologna, Bologna, Italy
[3] Univ Hamburg Hosp, Med Klin & Poliklin, D-2000 Hamburg, Germany
[4] New York Med Coll, Valhalla, NY 10595 USA
[5] VU Univ Med Ctr, Amsterdam, Netherlands
[6] Wyeth Ayerst Res, CR&D, Cambridge, MA USA
[7] Univ Milan, San Gerardo Hosp, Monza, Italy