RT Journal Article SR Electronic T1 Depth of cervical plexus block and diaphragmatic dysfunction JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2022-103650 DO 10.1136/rapm-2022-103650 A1 Peiqi Shao A1 Chao Han A1 Yun Wang YR 2022 UL http://rapm.bmj.com/content/early/2022/06/14/rapm-2022-103650.abstract AB