Kmiotek, Patrycja, and Andrzej Materniak. “Gastroesophageal Reflux Disease and Irritable Bowel Syndrome - Prevalence and Overlap”. Journal of Education, Health and Sport 9, no. 9 (September 17, 2019): 570–577. Accessed June 28, 2025. https://apcz.umk.pl/JEHS/article/view/7471.