- Correspondence to Dr Karl G Sylvester, Stanford Department of Surgery, Stanford University School of Medicine, Lucile Packard Children's Hospital, 777 Welch Rd Ste J, Palo Alto, CA 94305, USA;
- Received April 22, 2013
- Revised August 22, 2013
- Accepted August 23, 2013
- First published September 18, 2013.
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