- Correspondence to Dr Song Liu, UMR 788, INSERM et Université Paris-Sud, 80 rue du Général Leclerc, Le Kremlin-Bicêtre Cedex 94276, France;
- Received May 7, 2014
- Revised August 7, 2014
- Accepted August 28, 2014
- First published September 16, 2014.
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