RT Journal Article SR Electronic T1 India ink: a time-tested histological marker JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 755 OP 757 DO 10.1136/rapm-2019-100493 VO 44 IS 7 A1 Jennifer Szerb A1 Kwesi Kwofie A1 Vishal Uppal YR 2019 UL http://rapm.bmj.com/content/44/7/755.abstract AB