- Correspondence to Patrick D Hoek, Department of Anesthesiology, Pain, and Palliative Care, Radboud University Medical Center, P.O. Box 9101, Nijmegen 6500 HB, The Netherlands;
- Received July 7, 2015
- Revision received April 25, 2016
- Accepted May 31, 2016
- First published June 17, 2016.
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