- 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 12 July 2012
- Revised 20 November 2012
- Accepted 7 December 2012
- Published in print 1 April 2013.
- Published online 6 March 2013.
- Published first 15 January 2013.
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