- Correspondence to Dr Jochen Profit, Perinatal Epidemiology and Health Outcomes Research Unit, Division of Neonatal and Developmental Medicine, Department of Pediatrics, Stanford University School of Medicine, MSOB Rm x115, 1265 Welch Road, Stanford, CA 94305, USA;
- Received January 10, 2014
- Revised March 20, 2014
- Accepted March 29, 2014
- First published April 17, 2014.
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