1. P417 Frequent Early Nocebo Complaints but Maintained Clinical Efficacy, Biomarker and Therapeutic drug levels following mandatory Biosimilar Switch in Patients with Inflammatory Bowel disease: Preliminary data from a Prospective Observational Cohort Study. (30th January 2023) Authors: Wetwittayakhlang, P; Karkout, K; Tselekouni, P; Aljabri, R; Bessissow, T; Afif, W; Wild, G; Bitton, A; Lakatos PhD, P L Journal: Journal of Crohn's and colitis Issue: Volume 17(2023)Supplement 1 Page Start: i546 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗