RT Journal Article SR Electronic T1 Facet guidelines, serial medial branch blocks and issues surrounding recommending procedures with no mechanistic foundation JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2020-101634 DO 10.1136/rapm-2020-101634 A1 Steven P Cohen A1 David Anthony Provenzano A1 Samer Narouze YR 2020 UL http://rapm.bmj.com/content/early/2020/05/31/rapm-2020-101634.abstract AB