RT Journal Article SR Electronic T1 Reply to: Cervical plexus and greater occipital nerve blocks: controversies and technique update JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 89 OP 89 DO 10.1136/rapm-2019-100736 VO 45 IS 1 A1 Manfred Greher A1 Bernhard Moriggl A1 Jens Børglum YR 2020 UL http://rapm.bmj.com/content/45/1/89.1.abstract AB