1. Center of Excellence on Neurodegenerative Diseases, Department of Pharmacological Sciences (P.C., A.B., L.O., A.M.), 20133 Milan, Italy;
2. Institute of Radiological Sciences (A.B., L.O.), University of Milan, 20133 Milan, Italy;
3. Regina Elena Institute (L.T., C.T.), 00158 Rome, Italy;
4. Sigma-Tau Industrie Farmaceutiche Riunite S.p.A. (A.F.S.), Department of Endocrinology and Metabolism, 00040 Pomezia, Italy