Affiliation number 1 for the first, third, fourth, sixth and seventh authors is incorrect. The correct affiliation is: Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College.
In addition, a funding organization was incorrectly omitted from the Funding Statement. The Funding Statement should read: "This study was funded by Gong-Yi Program of China Ministry of Environmental Protection (200909016, 201209046, 201309045) and the President Fund of UCAS (University of Chinese Academy of Sciences). URL:http://kjs.mep.gov.cn/gyxhykyzx/. The funders had no role in study design, data collection and analysis, decision to publish, or preperation of the manuscript.
Footnotes
Competing Interests: No competing interests declared.