1. Department of Neurology, Hospital Eugenio Espejo, Quito, Ecuador
2. Faculty of Medicine, Central University of Ecuador, Quito, Ecuador
3. Preventive Neurology Unit, Wolfson Institute of Preventive Medicine, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
4. Department of Clinical and Movement Neurosciences & Reta Lila Weston, Institute of Neurology, London, UK