Li, Jia
Zhang, Di
Shen, Yong
Article History
Received: 21 March 2020
Accepted: 20 August 2020
First Online: 22 September 2020
Ethics approval and consent to participate
: The Ethics Committee of the Third Hospital of Hebei Medical University approved this study. Patient consent for review of medical records was not required, as all data were de-identified. All protocols were conducted in accordance with the research principles set forth in the Declaration of Helsinki.
: Not applicable.
: This material has not been published and is not under consideration elsewhere. The authors declare that they have no competing interests.