- Correspondence to Professor Cisca Wijmenga, Department of Genetics, University Medical Centre Groningen, PO Box 30001, Groningen 9700 RB, The Netherlands;
- Received 11 November 2012
- Revised 18 April 2013
- Accepted 23 April 2013
- Published in print 1 March 2014.
- Published online 4 February 2014.
- Published first 23 May 2013.
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