This paper was published online on 24 January 2012 with an omission in the Acknowledgments on page 6. ThenAcknowledgments should read as “This work was funded by the National Basic Research Program of China (GrantsnNo. 2009CB929204, No. 2012CB921604, and No.2011CB921204), the National Natural Science Foundation of China (GrantsnNo. 11174270, No. 11004186, No. 10874032, No. 10875110, No. 11074043, No. 60836001, and No. 60921091), the ResearchnFund for the Doctoral Program of Higher Education of China (Grant No. 20103402110024), the Fundamental Research Fundsnfor the Central Universities (Grant No. WK2470000006), and the Shanghai Municipal Government. H.M. is grateful for thensupport from the Fudan Undergraduate Research Opportunities Program and the National Science Fund for Talent Trainingnin Basic Science. Z.-W.Z. gratefully acknowledges the support of the K. C. Wong Education Foundation, Hong Kong”. ThenAcknowledgments have been corrected as of 26 July 2012. The Acknowledgments are incorrect in the printed version of thenjournal.
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机译：该论文于2012年1月24日在线发布，在第6页的“致谢”中作了删节。致谢的内容应为“这项工作是由中国国家基础研究计划（Grantsn No.2009CB929204，No.2012CB921604和No.2011CB921204）资助的”国家自然科学基金（Grantsn第11174270号，第11004186号，第10874032号，第10875110号，第11074043号，第60836001号和第60921091号），中国高等博士学位研究基金（批准号：20103402110024），中央大学基础研究基金（批准号：WK2470000006）和上海市政府。 H.M.感谢复旦大学本科生研究机会计划和国家基础科学人才培养科学基金的支持。 Z.-W.Z.非常感谢香港K. C. Wong教育基金会的支持。”截至2012年7月26日，声明已得到更正。声明在thenjournal的印刷版本中不正确。
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