Ivanko, O. V., and Аль-Хадраві Раад Абдулсад. “Application of Ultrasound Energy in Surgical Treatment of Chronic Hemorrhoids Stages III-IV”. Klinicheskaia khirurgiia 87, no. 5-6 (July 24, 2020): 55-59. Accessed January 15, 2021. https://hirurgiya.com.ua/index.php/journal/article/view/828.