- Correspondence to Professor Markus Schuelke, Department of Neuropediatrics, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, Berlin D-13353, Germany,
- Received December 19, 2012
- Revised April 15, 2013
- Accepted May 5, 2013
- First published May 31, 2013.
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