[1] Hosp Reg Teodoro Maldonado Carbo, Inst Ecuatoriano Seguridad Social, Neurol Serv, Guayaquil, Ecuador
[2] Univ Guayaquil, Sch Med, Guayaquil, Ecuador
[3] Hosp Clin Kennedy, Dept Neurol Sci, Guayaquil, Ecuador
[4] Univ Especialidades Espiritu Santo, Sch Med, Guayaquil, Ecuador