Article History
Received: 18 October 2020
Accepted: 27 January 2021
First Online: 3 February 2021
Ethics approval and consent to participate
: The study was conducted in accordance with the Declaration of Helsinki, and the protocol was approved by the Ethics Committee of Huizhou third people’s Hospital, which absolved the need for written informed consent because of the retrospective study. All personal identification data were anonymized and de-identified before analysis.
: Not applicable.
: The authors declare that they have no competing interests.