- Correspondence to Dr Young J Juhn, Division of Community Paediatric and Adolescent Medicine, Department of Paediatric and Adolescent Medicine, Mayo Clinic, 200 First Street, SW, Rochester, MN 55905, USA;
- Received July 12, 2012
- Revised November 20, 2012
- Accepted December 7, 2012
- First published January 15, 2013.
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