- Correspondence to Dr Wilhelmina S Kerstjens-Frederikse, Department of Genetics, University of Groningen, University Medical Center Groningen, UMCG, P.O. Box 30.001, 9700RB Groningen, The Netherlands;
- Received December 5, 2012
- Revised March 13, 2013
- Accepted March 19, 2013
- First published April 16, 2013.
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