2.1. Study Design
CVH, EVH
MAY
Institutional Review board approval: No-655, 13. January 2019.Ethics Committee, Faculty of medicine, University of Nis: No-12-3340-2/6, 26. May 2019.The study was approved by the institutional review board and the ethics committee of the medical faculty. Informed consent was obtained from all participants. The patients who underwent isolated CABG were randomly assigned to one of the three groups depending on vein harvesting techniques: conventional (CVH), no-touch (NT) and endoscopic (EVH) approaches.