Funding for this research was provided by:
General Foundation of scientific research in the Department of Education in Liaoning (L2015592)
Article History
Received: 19 February 2020
Accepted: 2 June 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: GBD 2017 was publicly available for free use, the protocol was approved by the Medical Research Ethics Committee of the First Hospital of China Medical University.
: Not applicable.
: The authors declare that they have no competing interests.