Open Up your Science in EHJ Open. Issue 1 (27th August 2021) - Bäck, Magnus; Banach, Maciej; Braunschweig, Frieder; De Rosa, Salvatore; Gimelli, Alessia; Kahan, Thomas; Ketelhuth, Daniel F J; Lancellotti, Patrizio; Larsson, Susanna C; Mellbin, Linda; Nagy, Edit; Savarese, Gianluigi; et al.