Cardiac arrhythmias in patients presenting with COVID-19 treated in Portuguese hospitals: A national registry from the Portuguese Association of Arrhythmology, Pacing and Electrophysiology Dinis Mesquita; Pedro Carmo; Nuno Cabanelas; Nuno Santos; Vítor Martins; Victor Sanfins; Helena Cristina Costa; José Paulo Fontes; Paulo Fonseca; Leonor Parreira;

Portuguese National Registry on Cardiac Electrophysiology, 2017 and 2018 Nuno Cortez-Dias; Pedro Silva Cunha; Francisco Moscoso Costa; Daniel Bonhorst; Mário M. Oliveira;

National Registry of Cardiac Electrophysiology (2015/2016) Helena Gonçalves; Hipólito Reis; Daniel Bonhorst;