Article History
Received: 29 December 2020
Accepted: 29 January 2021
First Online: 14 February 2021
Compliance with ethical standards
:
: The authors have no conflicts of interest to declare.
: Ethical approval was waived by the local Ethics Committee of the Chongqing Medical University in view of the retrospective nature of the study and all the procedures being performed were part of the routine care.
: Not applicable.
: Not applicable.