[1] Univ Roma La Sapienza, Dept Expt Med, Rome, Italy
[2] IRCCS Neuromed, Pozzilli, Isernia, Italy
[3] Univ Bologna, Sez Anat & Istol Patol, Dipartimento Clin Sci Radiol & Istocitopatol, Bologna, Italy
[4] Osped Infantile Regina Margherita, Dept Pathol, Turin, Italy
[5] Ist Nazl Tumori, Fdn IRCCS, Dept Expt Oncol, Mol Cytogenet Unit, I-20133 Milan, Italy