Abstract
Neurology Department of Hospital das Clinicas, Universidade de Sao Paulo (USP), Sao Paulo SP, Brazil.Correspondence: Ricardo de Carvalho Nogueira; Departamento de Neurologia, Hospital das Clinicas, Universidade de Sao Paulo; Avenida Dr. Eneas de Carvalho Aguiar 255/5131; 05403-000 Sao Paulo SP - Brasil; E-mail: rcnogueira28@ig.com.brConflict of interest: There is no conflict of interest to declare.Received 15 December 2011; Received in final form 29 March 2012; Accepted 09 April 2012
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