Angelak, A., Kalali, D., Chantzara, C., Faiq, L., Gad, M., Kadłubek, S., Kamiński, J., Charalampidi, Z., Charalampidis, C. and Anestakis, D. 2025. Detection of gastrointestinal cancers using salivary biomarkers – a systematic review. European Journal of Clinical and Experimental Medicine. 23, 3 (Sep. 2025), 750–766. DOI:https://doi.org/10.15584/ejcem.2025.3.11.