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History
- Received September 17, 2009
- Revision received January 22, 2010
- Accepted January 29, 2010
- First published April 14, 2010.
- Version of record published April 14, 2010.
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Copyright © 2010 the authors 0270-6474/10/305426-11$15.00/0
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Disclosures
- Received September 17, 2009.
- Revision received January 22, 2010.
- Accepted January 29, 2010.
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This work was supported by German Federal Ministry for Education and Research (Bundesministerium für Bildung und Forschung) Grants 01GQ0433 and 01GQ0814. We thank Sina Plümer and Ludwig Ehrenreich for their help in data collection.
- Correspondence should be addressed to Dr. Alexander Gail at the above address. agail{at}gwdg.de
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