Funding for this research was provided by:
The project of Tutorial System of Medical Undergraduate in Lab Teaching & Management Center in Chongqing Medical University (LTMCMTS202001)
Received: 10 February 2021
Accepted: 26 April 2021
First Online: 14 May 2021
: No patient consent was required for this retrospective cohort study.
: All authors have reviewed the manuscript and consent for publication.
: The authors declare that they have no competing interests.