Semen, M. O., Lychkovska, O. L., Semen, V. D., & Yelisieieva, O. P. (2022). Heart rate variability and trait anxiety in children with irritable bowel syndrome: is there a link?. Zaporozhye Medical Journal, 24(5), 547–555. https://doi.org/10.14739/2310-1210.2022.5.256942