- Correspondence to Dr Shu-Hong Zhu, Moores Cancer Center, University of California, San Diego, 9500 Gilman Drive MC 0905, La Jolla, San Diego, CA 92093–0905, USA;
- Received July 26, 2013
- Revised November 7, 2013
- Accepted December 12, 2013
- First published January 10, 2014.
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