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correct for authors

Posted by yanhui on 04 Jan 2013 at 13:25 GMT

I have checked the paper online, but there are lot of problem for the author contribution
1 there are two first author, jianhuazhu and tingchen contribute the equal
2 the correspondence authors also have two:one is lizhang, one is huiyan, the email should be li.zhang.uk@gmail.com and ting010151452@gmail.com

No competing interests declared.