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 73 OP 74 DO 10.1136/rapm-2021-102695 VO 47 IS 1 A1 Hochberg, Uri A1 de Santiago Moraga, Jesus YR 2022 UL http://rapm.bmj.com/content/47/1/73.abstract AB