Lisnyy, I. I., O. E. Chechelnitskiy, and V. M. Emets. “The Frequency of Mosaic Epidural Block During Labour. The Comparison of Two Kinds of Epidural Catheters”. Pain medicine 1, no. 2 (June 1, 2016). Accessed August 10, 2020. https://painmedicine.org.ua/index.php/pnmdcn/article/view/14.