1. Electrophysiology Unit, Alameda Oscar Niemayer 217, 34006-056, Nova Lima, Minas Gerais, Brazil
2. Pós-Graduação Ciências Médicas, Faculdade Ciências Médicas, Alameda Ezequiel Dias 275, 1st floor, 30130-110, Belo Horizonte, Minas Gerais, Brazil
3. Division of Cardiovascular Medicine, level 6, West Wing, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK