[1] Inst Sci, Milan, Italy
[2] Univ Vita Salute San Raffaele, Milan, Italy
[3] Univ Siena, I-53100 Siena, Italy
[4] Vrije Univ Amsterdam Med Ctr, Amsterdam, Netherlands
[5] Hosp Valle De Hebron, Barcelona, Spain
[6] UCL, Inst Neurol, London, England
[7] Med Univ Graz, Graz, Austria
[8] San Camillo Forlanini Hosp, Rome, Italy
[9] Glostrup Cty Hosp, Copenhagen, Denmark
[10] Univ Copenhagen, Copenhagen, Denmark