[1] Univ Rio Grande Sul UFRGS, Fac Med, PostGrad Program Med Med Sci, Porto Alegre, RS, Brazil
[2] Hosp Clin Porto Alegre, Expt Res Ctr, Translat Nucleus Pain Pharmacol & Neuromodulat, Porto Alegre, RS, Brazil
[3] Hosp Clin Porto Alegre, Expt Res Ctr, Embryol & Cell Differentiat Lab, Porto Alegre, RS, Brazil
[4] Hosp Clin Porto Alegre, Expt Res Ctr, Expt Lab Hepatol & Gastroenterol, Porto Alegre, RS, Brazil
[5] Spaulding Rehabil Hosp, Dept Phys Med & Rehabil, Lab Neuromodulat, Boston, MA USA
[6] Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA 02115 USA
[7] Harvard Med Sch, Ctr Noninvas Brain Stimulat, Beth Israel Deaconess Med Ctr, Boston, MA 02115 USA
[8] Hosp Clin Porto Alegre, Biomed Engn Lab, Res & Post Grad Grp, Porto Alegre, RS, Brazil