- Correspondence to Dr Peter C van den Akker, Department of Genetics, University Medical Center Groningen, Hanzeplein 1, PO Box 30.001, 9700 RB Groningen, The Netherlands;
- Received June 21, 2010
- Revised September 1, 2010
- Accepted September 23, 2010
- First published November 26, 2010.
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