GRAD, Sylwia, JAREMEK, Anna, KĘPA, Joanna, KANDEFER, Norbert, WYSZKOWSKI, Michał, GRABARCZYK, Aleksandra, PAWLAK, Anna, GREGOREK, Małgorzata and GREGOREK, Paweł. The Influence of obesity and overweight on the incidence of gastrointestinal tumors - a systematic review of the literature. Journal of Education, Health and Sport. Online. 25 November 2023. Vol. 48, no. 1, pp. 135-146. [Accessed 28 June 2025]. DOI 10.12775/JEHS.2023.48.01.009.