Received: 28 May 2019
Accepted: 26 June 2020
First Online: 1 July 2020
Ethics approval and consent to participate
: All participants provided written informed consent prior to participating in the survey. This study was approved by the Survey and Behavioral Ethics Committee of the School of Public Health, Jilin University.
: Publication consent was obtained from all individual participants included in the study.
: The authors have no conflicts of interest in conducting this study or preparing the manuscript.