RT Journal Article SR Electronic T1 Superior costotransverse ligament is the main actor in permeability between the layers? Target-specific modification of erector spinae plane block JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2019-101031 DO 10.1136/rapm-2019-101031 A1 Sami Kaan Coşarcan A1 Alper Tunga Doğan A1 Ömür Erçelen A1 Yavuz Gürkan YR 2019 UL http://rapm.bmj.com/content/early/2019/12/18/rapm-2019-101031.abstract AB