Loriane M M Verleye, MSc; Marieke J Pierik, MD, PhD; Annemarie C de Vries, MD, PhD; Fiona D M van Schaik, MD, PhD; Andrea E van der Meulen-de Jong, MD, PhD; Willemijn A van Dop, MD, PhD; Mark Löwenberg, MD, PhD; Marijn C Visschedijk, MD, PhD; Myrthe R Naber, MD; Dianne G Bouwknegt, MD; Tessa E H Römkens, MD, PhD; Alexander G L Bodelier, MD, PhD; Philip W Voorneveld, MD, PhD; Bas Oldenburg, MD, PhD; Lauranne A A P Derikx, MD, PhD; Marjolijn Duijvestein, MD, PhD; Zlatan Mujagić, MD, PhD; the Dutch Initiative on Crohn and Colitis (ICC); null