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 586 OP 586 DO 10.1136/rapm-2022-103650 VO 47 IS 9 A1 Shao, Peiqi A1 Han, Chao A1 Wang, Yun YR 2022 UL http://rapm.bmj.com/content/47/9/586.1.abstract AB