Funding for this research was provided by:
National Science Foundation (16CSH049)
Received: 14 April 2020
Accepted: 3 August 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of Shenzhen University and all subjects provided written informed consent in accordance with the Helsinki declaration. As all data was entered in a completely anonymized manner, consent to participate was not required.
: As completely anonymized observational data was used (see “Ethics approval and consent to participate”), consent for publication was not required.
: The authors declare no conflicts of interest associated with this research study.