Influence of low-opioid anesthesia in cardiac surgery on dynamics of pro-inflammatory interleukin-6 - Loskutov, Oleh; Maruniak, Stepan; Dryzhyna, Olexandr; Malysh, Ihor; Kolesnykov, Volodymyr; Korotchuk, Natalia (Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery, 2020)