A randomized trial to compare the analgesic effect of pecto-intercostal fascial plane block with erector spinae plane block after mid-sternotomy incision for cardiac surgery - Keshwani, Manish; Dey, Samarjit; Arora, Prateek; Singha, Subrata (Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery, 2023)