[1] Univ Milan, Ist Ricovero & Cura Carattere Sci, Ist Ric Farmacol Mario Negri, Milan, Italy
[2] Ist Ric Farmacol Mario Negri, Ist Ricovero & Cura Carattere Sci, Milan, Italy
[3] Commiss European Communities, Joint Res Ctr, European Commiss, I-21020 Ispra, Italy
[4] Azienda Unita Sanit Locale Modena, Modena, Italy
[5] Ist Ricovero & Cura Carattere Sci, Arcispedale S Maria Nuova, Reggio Emilia, Italy