1 From the Departments of Neurology (A.C., N.M., F.P., J.Q.N., R.R.) and Pathology (F.V.), British Hospital of Buenos Aires, Argentina. anibalchertcoff@gmail.com.
2 From the Departments of Neurology (A.C., N.M., F.P., J.Q.N., R.R.) and Pathology (F.V.), British Hospital of Buenos Aires, Argentina.