RT Journal Article SR Electronic T1 Evaluation of lumbar medial branch blocks: how does the second block influence progression to radiofrequency ablation? JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2022-103754 DO 10.1136/rapm-2022-103754 A1 Provenzano, David Anthony A1 Leech, Jozef E A1 Kilgore, Jason S A1 Sugden, Lauren A YR 2022 UL http://rapm.bmj.com/content/early/2022/07/27/rapm-2022-103754.abstract AB