[1] Ist Ricovero & Cura Carattere Sci, Ctr S Giovanni Dio, Neurobiol Lab, Alzheimers Dis Unit, I-25123 Brescia, Italy
[2] Univ Brescia, Sch Med, Inst Chem, I-25123 Brescia, Italy
[3] Univ Roma Tor Vergata, Dept Expt Med & Biochem Sci, I-00154 Rome, Italy
[4] Univ Zurich, Dept Psychiat Res, CH-8091 Zurich, Switzerland
[5] Harvard Univ, Sch Med, Dept Neurol, Boston, MA 02114 USA