- Correspondence to Dr Congrong Liu, Department of Pathology, School of Basic Medical Sciences, Third Hospital, Peking University Health Science Center, 38 College Road, Haidian, Beijing 100191, China;
- Received September 10, 2014
- Revised October 23, 2014
- Accepted November 8, 2014
- First published December 1, 2014.
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