Feng, Lvfan
Tian, Yuan
He, Mei
Tang, Jie
Peng, Ying
Dong, Chenjie
Xu, Wenzhong
Wang, Tao
He, Jiangjiang
Article History
Received: 14 May 2020
Accepted: 1 October 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: Since we looked at the performance of hospitals and no animal or human data or tissue was involved in this study, a local ethics committee ruled that no formal ethics approval was required in this particular case. We supplement the data authorization letter provided by the data source owner organization.Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.