- Correspondence to Dr Joseph T Poterucha, Division of Pediatric Cardiology, Department of Pediatric and Adolescent Medicine, Mayo Clinic College of Medicine, 200 1st St SW, Rochester, MN 55905, USA;
- Received 22 July 2015
- Revised 16 November 2015
- Accepted 23 November 2015
- Published online 23 December 2015.
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