- Correspondence to Dr Marin Guentchev, Department of Neurosurgery, Klinikum Idar-Oberstein, Dr. Ottmar-Kohler Str. 2, Idar-Oberstein 55743, Germany;
- Received January 19, 2015
- Accepted May 28, 2015
- First published June 24, 2015.
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