Postoperative pain relief in general surgery - recommendations of the Association of Polish Surgeons, Polish Society of Anaesthesiology and Intensive Therapy, Polish Association for the Study of Pain and Polish Association of Regional Anaesthesia and Pain Treatment - Wordliczek, Jerzy; Zajączkowska, Renata; Dziki, Adam; Jackowski, Marek; Richter, Piotr; Woroń, Jarosław; Misiołek, Hanna; Dobrogowski, Jan; Paśnik, Krzysztof; Wallner, Grzegorz; Malec-Milewska, Małgorzata (Polish Journal of Surgery, 2019)