Received: 24 February 2021
Accepted: 28 March 2021
First Online: 6 April 2021
: The study complied with the Declaration of Helsinki and was approved by the Ethics Committee of Beijing Chaoyang Hospital (No. 2020-D.-451-2). Participant informed consent was exempted because of the retrospective study design, and the study design was approved by the appropriate ethics review board.
: Not applicable.
: The authors declare that they have no conflict of interest.