Foteinogiannopoulou K, Karmiris K, Axiaris G, Velegraki M, Gklavas A, Kapizioni C, Karageorgos C, Kateri C, Katsoula A, Kokkotis G, Koureta E, Lamouri C, Markopoulos P, Palatianou M, Pastras P, Fasoulas K, Giouleme O, Zampeli E, Theodoropoulou A, Theocharis G, Thomopoulos K, Karatzas P, Katsanos KH, Kapsoritakis A, Kourikou A, Mathou N, Manolakopoulos S, Michalopoulos G, Michopoulos S, Boubonaris A, Bamias G, Papadopoulos V, Papatheodoridis G, Papaconstantinou I, Pachiadakis I, Soufleris K, Tzouvala M, Triantos C, Tsironi E, Christodoulou DK, Koutroubakis IE; Hellenic group for the study of IBD. BMC Gastroenterol 2021;21(1):269. doi: 10.1186/s12876-021-01826-1. Erratum in: BMC Gastroenterol 2021;21(1):301.