2021 ESC Guidelines on cardiac pacing and cardiac resynchronization therapy: Developed by the Task Force on cardiac pacing and cardiac resynchronization therapy of the European Society of Cardiology (ESC) With the special contribution of the European Heart Rhythm Association (EHRA). Issue 1 (29th August 2021) - Glikson, Michael; Nielsen, Jens Cosedis; Kronborg, Mads Brix; Michowitz, Yoav; Auricchio, Angelo; Barbash, Israel Moshe; Barrabés, José A.; Boriani, Giuseppe; Braunschweig, Frieder; Brignole, Michele; Burri, Haran; Coats, Andrew J. S.; et al.