- Correspondence to Dr Jochen Profit, Department of Pediatrics, Stanford University, 1265 Welch Rd, x115, Stanford, CA 94305, USA;
- Received December 30, 2014
- Revised November 12, 2015
- Accepted November 15, 2015
- First published December 23, 2015.
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- Data supplement 1 - Online supplement
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