1. University of Western Ontario; Clinical Neurological Sciences; 339 Windermere Road London Ontario Canada N6A 5A5
2. Osservatorio Epidemiologico - Regione Umbria; Cochrane Neurological Network; Via M. Angeloni, 61 Perugia Italy 06124
3. Azienda Ospedaliera Ospedale Niguarda Ca' Granda; P.zza Ospedale Maggiore, 3 Milan Italy 20162
4. University of Oxford; Clinical Neurology; 3rd Floor - West Wing John Radcliffe Hospital Oxford UK OX3 9DU
5. VU Medical Centre; Neurology; De Boelelaan 1117 - P.O. Box 7057 Amsterdam Netherlands 1007
6. University of Modena and Reggio Emilia; Department of Oncology and Hematology; Via del Pozzo 71 Modena Italy
7. Fondazione I.R.C.C.S. - Istituto Neurologico C.Besta; Neuroepidemiology Unit; via Celoria 11 Milano Italy 20133