Pulmonary veins isolation to treat patients with refractory paroxysmal atrial fibrillation: clinical results after a single procedure - Scanavacca, Mauricio Ibrahim; Sartini, Raul; Tondato, Fernando; D'Avila, André Luiz B.; Darrieux, Francisco; Sosa, Eduardo Argentino (Arquivos Brasileiros de Cardiologia, 2004)