RT Journal Article SR Electronic T1 Ultrasound-guided retrolaminar cervical block JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2021-102695 DO 10.1136/rapm-2021-102695 A1 Uri Hochberg A1 Jesus de Santiago Moraga YR 2021 UL http://rapm.bmj.com/content/early/2021/05/23/rapm-2021-102695.abstract AB