Funding for this research was provided by:
Sichuan Provincial Cadre Health Care Research Project (ZH2018-1801)
Sichuan Provincial Medical Research Youth Innovation Project (Q17070)
Special Foundation of Basic Science and Technology Resources Survey of the Ministry of Science and Technology (2017FY101200)
China Short-Term Health Effects of Air Pollution Study (2016YFC0206500)
Received: 24 December 2018
Accepted: 19 June 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: Not applicable. This study does not involve experimental animals or individual information on human subjects.
: Not applicable.
: The authors declare that they have no competing interests.