COMPARATIVE ANALYSIS OF THE ECONOMIC INDICATORS OF THE ACTIVITIES OF MULTI-PROFILE HOSPITALS FOR ACTIVE TREATMENT IN BULGARIA AND THEIR CHANGE AS A RESULT OF THE COVID-19 PANDEMIC. mij [Internet]. 2022 Sep. 25 [cited 2026 Aug. 22];1(3):49-54. Available from: https://medisij.com/index.php/mij/article/view/171