1. Pharmacology Unit, Medical School Universidad de La Laguna Tenerife Spain
2. Neurology Service Hospital Universitario de Canarias Tenerife Spain
3. Neurology Service Hospital Universitario Nuestra Señora de la Candelaria Tenerife Spain
4. King's College Hospital, Denmark Hill NHS Foundation Trust London UK
5. Centro Neurológico Dr A. Alayón Santa Cruz de Tenerife Spain