- Correspondence to Dr Charlotte Summers, Division of Anaesthesia, Department of Medicine, Box 93, Level 4, Addenbrooke's Hospital, CUHNHSFT, Hills Road, Cambridge CB2 OQQ, UK;
- Received January 26, 2016
- Revised April 18, 2016
- Accepted May 9, 2016
- First published August 22, 2016.
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.