Semen, M. O., O. L. Lychkovska, V. D. Semen, and O. P. Yelisieieva. “Heart Rate Variability and Trait Anxiety in Children With Irritable Bowel Syndrome: Is There a Link?”. Zaporozhye Medical Journal 24, no. 5 (October 22, 2022): 547–555. Accessed November 13, 2024. http://zmj.zsmu.edu.ua/article/view/256942.