Pękala, A., D. Aebisher, P. Pardak, and R. Filip. “Efficacy and safety of biosimilar IFX (CT-P13) and adalimumab in patients with active fistulizing perianal Crohn’s disease naďve to anti-TNF therapy: preliminary results from the POLIBD study”. European Journal of Clinical and Experimental Medicine, vol. 17, no. 1, Mar. 2019, pp. 12–15, doi:10.15584/ejcem.2019.1.2.