Electrical cardioversion of atrial fibrillation and atrial flutter: manoeuvres and tips to increase its effectiveness—Authors' reply. Issue 10 (5th August 2020) - Brandes, Axel; Crijns, Harry J G M; Rienstra, Michiel; Kirchhof, Paulus; Grove, Erik L; Pedersen, Kenneth Bruun; Van Gelder, Isabelle C