Affiliation: | 1. Service of Neurology, University Hospital “Central de Asturias” and INEUROPA, Oviedo, Spain;2. Geisel School of Medicine at Darmouth, Hanover, NH, USA;3. Autonomous University of Chile, Santiago, Chile;4. University Hospital “Marqués de Valdecilla” and IDIVAL, Santander, Espa?a |