1. Escuela de Medicina, Universidad Catolica Santiago de Guayaquil, Guayaquil, Ecuador.
2. Department of Neurology, Hospital Clinica Kennedy Guayaquil, Guayaquil, Ecuador.
3. Department of Medicine, Morristown Medical Center, Morristown, New Jersey.
4. Division of Population Health and Computational Medicine, Miller School of Medicine, University of Miami, Miami, Florida.
5. GRECC, Geriatric Research Education and Clinical Center, Veterans Affairs Medical Center, Miami, Florida.