Herzog, D. ., Fournier, N. ., Buehr, P. ., , Koller, R. ., Heyland, K. ., … Study, G. S. I. C. (2018). Age at disease onset of inflammatory bowel disease is associated with later extraintestinal manifestations and complications. European Journal of Gastroenterology & Hepatology. https://doi.org/10.1097/MEG.0000000000001072 (Original work published 2018)