- Correspondence to Dr Imme Petersen, University of Hamburg, Research Centre for Biotechnology, Society and the Environment, Research Group on Medicine and Neuroscience, Lottestrasse 55, D-22529 Hamburg, Germany;
- Received October 24, 2009
- Revised November 17, 2010
- Accepted December 10, 2010
- First published February 23, 2011.
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