[1] Inst Nacl Ciencias Neurol, Lima, Peru
[2] Univ Nacl Mayor San Marcos, Lima, Peru
[3] Univ Peruana Cayetano Heredia, Lima, Peru
[4] Inst Nacl Ciencias Neurol, Unidad Invest Enfermedades Neuromusculares, Lima, Peru
[5] Univ San Ignacio Loyola, Lima, Peru
[6] Spaulding Rehabil Hosp, Neuromodulat Ctr, Boston, MA USA
[7] Spaulding Rehabil Hosp, Ctr Clin Res Learning, Boston, MA USA
[8] Massachusetts Gen Hosp, Boston, MA 02114 USA