[1] Univ Barcelona, Hosp Clin, Neurol Serv, Inst Clin Malalties Sistema Nervios, E-08036 Barcelona, Spain
[2] Univ Barcelona, Hosp Clin, Serv Otorhinolaryngol, E-08036 Barcelona, Spain
[3] Univ Barcelona, Hosp Clin, Genet Serv, E-08036 Barcelona, Spain