- Correspondence to RQ Hintzen, Department of Neurology, Erasmus MC, Room Ee2230, PO Box 2040, Rotterdam 3000 CA, The Netherlands;
- Received September 23, 2013
- Revised November 11, 2013
- Accepted November 14, 2013
- First published December 5, 2013.
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- Data supplement 1 - Online supplement
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