Dong, Ziyu
Li, Li
Lei, Yalin
Wu, Sanmang
Yan, Dan
Chen, Hong
Funding for this research was provided by:
National Natural Science Foundation of China (71803182)
Article History
Received: 19 March 2020
Accepted: 26 August 2020
First Online: 4 September 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: Our manuscript does not report on or involve the use of any animal or human data or experiment. The data we used were from China Statistical Yearbook from 2000 to 2015, China Health and Family Planning Statistical Yearbook in 2015, the Urban Statistical Yearbook of the Cities in Fenwei Plain, and China Population and Employment Statistics Yearbook in 2016 and it did not involve ethical issues.
: Our manuscript does not report on or involve the use of any animal or human data or experiment.
: Our manuscript does not contain data from any individual person.