Early removal of chest drains in patients following off-pump coronary artery bypass graft (OPCAB) is not inferior to standard care – study in the Enhanced Recovery After Surgery (ERAS) group - Zurek, Slawomir; Kurowicki, Arkadiusz; Borys, Michał; Iwasieczko, Artur; Woloszczuk-Gebicka, Bogumila; Czuczwar, Miroslaw; Widenka, Kazimierz (Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery, 2021)