Funding for this research was provided by:
Science and Technology Bureau of Sichuan province (18ZDYF1970)
Text and Data Mining valid from 2020-03-29
Received: 13 October 2019
Accepted: 20 February 2020
First Online: 29 March 2020
Ethics approval and consent to participate
: All data were abstracted from Chinese GBD study, where national but not provincial data can be accessed in public: ExternalRef removed. Given that the data collection, retrieval, and usage for our research did not involve humans or animals, IRB Committee of Sichuan CDC hereby waives the need of ethical approval of research. (IRB number: SCCDCIRB-7020-001, approval date: 12 February 2020).
: Not Applicable.
: All authors declare that they have no competing interests.