- Correspondence to Dr Ralf Krage, Department of Anaesthesiology, VU University Medical Centre, De Boelelaan 1117, Amsterdam 1081 HV, The Netherlands;
- Received 1 February 2016
- Revised 8 May 2017
- Accepted 9 May 2017
- Published in print 1 November 2017.
- Published online 23 October 2017.
- Published first 26 August 2017.
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