Funding for this research was provided by:
Nanjing Medical University (JX21831803/004)
Jiangsu Commission of Health (Z2018013)
Received: 26 July 2020
Accepted: 28 January 2021
First Online: 12 February 2021
Ethics approval and consent to participate
: All participants volunteered for the study, were informed about the scope of the study and provided written consent. The study was approved by the Local Committee for Research and Ethics in Health Research of Nanjing Medical University.
: Not applicable.
: The authors declare that they have no competing interests.