Received: 6 July 2018
Accepted: 6 September 2018
First Online: 15 October 2018
: JY and WS are neurosurgical registrars (residents) at Derriford Hospital (Plymouth)/Southmead Hospital (Bristol) in Southwest England, both with a special interest in trauma. LL is an experienced consultant neuroradiologist, and TG is the senior spinal neurosurgeon of the Centre.
: Not applicable. This study does not involve patient interventions. The study has been approved by the Audit Department of University Hospitals Plymouth NHS Trust, Derriford Hospital, Level 7, Plymouth, Devon PL6 8DH, UK (reference number CA_2018–19-090). No further ethics approval was deemed necessary.
: All consultants involved in the study have consented for publication. No identifiable patient data was used.
: The authors declare that they have no competing interests.