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;

Potential use of renin-angiotensin-aldosterone system inhibitors to reduce COVID-19 severity Jorge Gonçalves; Catarina D. Santos; Paula Fresco; Fernando Fernandez-Llimos;

Effects of azithromycin on ventricular repolarization in children with COVID-19 Suleyman Sunkak; Mustafa Argun; Binnaz Celik; Onur Tasci; Agah Bahadir Ozturk; Dogan Bahadir Inan; Murat Dogan;