- Correspondence to Dr Nathaniel H Greene, Department of Anesthesiology and Pediatrics, School of Medicine, Duke University, MD, DUMC Box 3094, Durham, NC 27710, USA;
- Received December 16, 2014
- Revised April 20, 2015
- Accepted April 21, 2015
- First published May 18, 2015.
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.