Risk of malignant lymphomas in patients with inflammatory bowel disease: a population-based cohort study oleh Hans-Olov Adami, Lise M Helsingen, Michael Bretthauer, Mette Kalager, Jingru Yu, Weimin Ye, Paulina Wieszczy, Magnus Løberg, Johannes Blom, Erle Refsum, Vera Perrin, Amanda Högdén