Semen, M.O., Lychkovska, O.L., Tyrkus, M.Y. , Kaminskyy, D.V. and Yelisyeyeva, O.P. 2023. Association between Val158Met polymorphism in the COMT gene with anxiety and heart rate variability in children with irritable bowel syndrome. Zaporozhye Medical Journal. 25, 5 (Sep. 2023), 439–446. DOI:https://doi.org/10.14739/2310-1210.2023.5.278878.