He, Hairong
Liu, Tianjie
Han, Didi
Li, Chengzhuo
Xu, Fengshuo
Lyu, Jun
Gao, Ye
Funding for this research was provided by:
the National Social Science Foundation of China (16BGL183)
Key Research and Development Program of Shaanxi Province, China (2019SF-140)
Article History
Received: 16 May 2021
Accepted: 3 July 2021
First Online: 26 July 2021
Declarations
:
: Not applicable. SEER is a publically available anonymous data source, so this study was not reviewed by a Human Subjects Committee.
: Not applicable.
: The authors declare that they have no competing interests.