- Correspondence to Dr David F Johnston, Department of Anaesthesia and Perioperative Medicine, The Royal Victoria Hospital, Belfast Trust, Belfast BT12 6BA, UK;
- Received October 20, 2017
- Revision received April 17, 2018
- Accepted April 22, 2018
- First published January 3, 2019.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.