1. SANNA/Clínica Sanchez Ferrer, Trujillo 13009, Peru
2. Faculty of Medicine, Universidad Católica Santo Toribio de Mogrovejo, Chiclayo 14012, Peru
3. Clínica AngloAmericana, Lima 15073, Peru
4. Research Department, General Hospital of Mexico “Dr. Eduardo Liceaga”, Mexico City 06720, Mexico
5. Hospital Angeles Interlomas, Mexico City 52763, Mexico
6. Hospital Central, Facultad de Medicina UASLP, San Luis Potosí 78210, Mexico
7. Neurology Service, University Hospital Dr. J. E. González, Autonomous University of Nuevo León, Monterrey 64300, Mexico
8. Instituto Central de Medicina, La Plata B1902, Argentina
9. Faculty of Health Sciences, Universidad Señor de Sipán, Chiclayo 14000, Peru