Boyko, V. V., Yu. V. Ivanova, and M. E. Tymchtnko. “SURGICAL TREATMENT OF HIGH-RISK PATIENTS IN PATIENTS”. Kharkiv Surgical School0, no. 3-4 (December 20, 2019): 6-11. Accessed December 1, 2021. https://surgical-school.com.ua/index.php/journal/article/view/4.