P. Pawłowska, A. Skorupa, A. Nowińska, J. Iwanicki, and B. Nieradko-Iwanicka, “Diseases of the digestive system as the cause of disability certificates”, Pol J Public Health, vol. 133, pp. 7–10, Jun. 2023, doi: 10.12923/2083-4829/2023-0002.