1. Istituto di Ricerche di Biologia Molecolare (IRBM), 00040 Pomezia, Rome, Italy.
2. Memorial Sloan-Kettering Cancer Center, New York, NY 10021.
3. Karmanos Cancer Institute, Wayne State University, Detroit, MI 48201.
4. Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), National Cancer Institute G. Pascale, 80131 Naples, Italy.