Corrigendum to: Exploring the concept of centralization of surgery for benign esophageal diseases: a Delphi based consensus from the European Society for Diseases of the Esophagus. Issue 8 (13th April 2021) - Lugaresi, Marialuisa; Nafteux, Philippe; Nilsson, Magnus; Reynolds, John V; Rosati, Riccardo; Schoppmann, Sebastian F; Targarona, Eduardo M; Mattioli, Sandro