- Correspondence to Professor Dr Marina A J de Koning-Tijssen, Movement Disorders, Department of Neurology AB 51, University medical Centre Groningen (UMCG) PO Box 30.001, 9700 RB Groningen, The Netherlands;
- Received September 8, 2011
- Revised January 12, 2012
- Accepted March 16, 2012
- First published May 23, 2012.
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