Continuous lumbar erector spinae plane block as an alternative to epidural analgesia in pain treatment in patients undergoing hip replacement surgery – a prospective pilot study oleh Agata Hanych, Paweł Kutnik, Przemysław Pasiak, Aleksandra Zakrzewska-Szalak, Oksana Wichowska, Mariusz Jednakiewicz, Adam Nogalski, Paweł Piwowarczyk, Michał Borys