1. School of Medicine; Universidad Espíritu Santo - Ecuador
2. Department of Neurological Sciences; Hospital-Clínica Kennedy; Guayaquil
3. Gastroenterology Department; Vanderbilt University; Nashville Tennessee
4. Community Center; Atahualpa Ecuador
5. Departments of Psychiatry and Neurology, and Gertrude H. Sergievsky Center; Columbia University; New York New York USA
6. McKnight Brain Institute and Department of Neurology; Miller School of Medicine; University of Miami; Miami Florida USA