[1] Hosp Carlos Andrade Marin, Neurol, Quito, Ecuador
[2] Univ Cent Ecuador, Neurol, Quito, Ecuador
[3] Hosp Jose Carrasco Arteaga, Neurol, Cuenca, Ecuador
[4] Hosp Teodoro Maldonado Carbo, Neurol, Guayaquil, Ecuador
[5] Hosp Eugenio Espejo, Neurol, Quito, Ecuador
[6] Hosp Gen Fuerzas Armadas, Neurol, Quito, Ecuador