A. Michalak, B. Kasztelan-Szczerbinska, K. Laskowska, P. Radwan, M. Cybulski, and H. Cichoż-Lach, “Efficacy of biological treatment in inflammatory bowel disease – a single-center experience”, Pol J Public Health, vol. 129, no. 3, pp. 105–109, May 2020, doi: 10.2478/pjph-2019-0024.