Corrigendum: Non-adherence to Anti-TNF Therapy is Associated with Illness Perceptions and Clinical Outcomes in Outpatients with Inflammatory Bowel Disease: Results from a Prospective Multicentre Study. (30th June 2018) - van der Have, Mike; Oldenburg, Bas; Kaptein, Ad A; Jansen, Jeroen M; Scheffer, Robert C H; van Tuyl, Bas A; van der Meulen-de Jong, Andrea E; Pierik, Marieke; Siersema, Peter D; van Oijen, Martijn G H; Fidder, Herma H