[1] IRCCS, CSS Mendel Inst, Rome, Italy
[2] Inst Neurol, London WC1N 3BG, England
[3] Univ Roma La Sapienza, I-00185 Rome, Italy
[4] Inst Child Hlth, London, England
[5] JW Goethe Univ Klin, Frankfurt, Germany
[6] Catholic Univ, Rome, Italy
[7] Natl Neurol Inst C Besta, Milan, Italy
[8] NIH, Bethesda, MD 20892 USA
[9] Hosp Univ San Cecilio, Granada, Spain
[10] Univ Modena, I-41100 Modena, Italy
[11] Univ London, London WC1E 7HU, England
[12] Sch Pharm, Modena, Italy