The affiliation of Xiang Liu was originally given as Southeast University.
The correct affiliation is Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University.
The affiliation of Fei Men was originally given as Southeast University. The correct affiliation is Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University.
This article was originally published with incorrect affiliations for two authors.
The errors have been corrected and the online HTML and PDF versions updated. The authors apologise for the error.