In the Funding section, the grant number from the funder the National Natural Science Foundation of China is listed incorrectly. The correct grant number is: 31072055. The complete, correct funding information is as follows: This work was financially supported by the National Natural Science Foundation of China (Project no. 31072055) and The Ministry of Science and Technology of China (Project no. 2011BAD26B03-4). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.