Received: 1 January 2021
Accepted: 18 February 2021
First Online: 25 February 2021
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Harbin Medical University for Medical Sciences. All procedures were carried out an adequate understanding and each participant provided their online informed consent prior to the study.
: Not applicable.
: The authors have no conflicts of interest to declare.