Kaddoum, R., C. Foz, M. Ibrahim, and D. Anghelescu. “Acute Opioid Withdrawal Following the Discontinuation of a Short Term Epidural Fentanyl Infusion”. Anaesthesia, Pain & Intensive Care, Jan. 2019, pp. 514-6, https://apicareonline.com/index.php/APIC/article/view/273.