^Karanikolas M, Aretha D, Kiekkas P, Monantera G, Tsolakis I, Filos KS. Case report. Intravenous fentanyl patient-controlled analgesia for perioperative treatment of neuropathic/ischaemic pain in haemodialysis patients: a case series. J Clin Pharm Ther. October 2010, 35 (5): 603–8. PMID 20831684. S2CID 205331535. doi:10.1111/j.1365-2710.2009.01114.x.