Isolation of pulmonary veins with duty-cycled circular multi-polar catheter : randomized controlled clinical trial - Pinto, Fausto J.; Sobral, S.; Ribeiro, J.; Barreiros, C.; Bernardes, Ana; António, P. Silvério; Ferreira, A. Nunes; Silva, Gustavo Lima; Carpinteiro, Luís; Cortez-Dias, Nuno; Sousa, João de (2020)