Li, Jia
Zhang, Di
Shen, Yong
Qi, Xiangbei
Article History
Received: 21 March 2020
Accepted: 29 July 2020
First Online: 14 August 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. All authors have read and contributed to the submitted manuscript, and there is no conflict of interest among the authors.