Evaluation of thoracic epidural analgesia in patients undergoing coronary artery bypass surgery – a prospective randomized trial - Obersztyn, Maciej; Trejnowska, Ewa; Nadziakiewicz, Paweł; Knapik, Piotr (Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery, 2018)