1. Post-Graduate Program in Biologic Sciences, Physiology, Institute of Basic Health Sciences, Universidade Federal Do Rio Grande Do Sul; Porto Alegre Rio Grande Do Sul Brazil
2. Laboratory of Pain and Neuromodulation, Hospital De Clínicas De Porto Alegre (HCPA); Porto Alegre Rio Grande Do Sul Brazil
3. Post-Graduate Program in Medical Sciences, School of Medicine, Universidade Federal Do Rio Grande Do Sul; Porto Alegre Rio Grande Do Sul Brazil
4. Pharmacology Department; Institute of Basic Health Sciences, Universidade Federal Do Rio Grande Do Sul; Porto Alegre Rio Grande Do Sul Brazil
5. Department of Physical Medicine and Rehabilitation; Harvard Medical School; Boston Massachusetts USA