- Correspondence to Dr Zhongming Zhao, Department of Biomedical Informatics, Vanderbilt University School of Medicine, 2525 West End Avenue, Suite 600, Nashville, TN 37203, USA;
- Received August 4, 2011
- Revised November 1, 2011
- Accepted November 20, 2011
- First published December 20, 2011.
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