RT Journal Article SR Electronic T1 Incidence of subdural catheter placement during epidural procedure based on fluoroscopic imaging JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2020-102211 DO 10.1136/rapm-2020-102211 A1 Sidash, Stanislav A1 Zhang, XueWei A1 Herrick, Michael A1 McIntyre, John J A1 Sites, Brian D YR 2021 UL http://rapm.bmj.com/content/early/2021/01/03/rapm-2020-102211.abstract AB