1. Laboratory of Electrophysiology, Superior Institute of Biomedical Sciences, State University of Ceará, Avenue Paranjana, 1700 Campus of Itaperi, 60740-903 Fortaleza, CE, Brazil
2. Department of Clinical Medicine, Federal University of Ceará, Street Prof. Costa Mendes, 608 Campus Porangabuçu, 60.430-140 Fortaleza, CE, Brazil