Funding for this research was provided by:
National Natural Science Foundation of China (81473027)
Six Talent Peaks Project in Jiangsu Province (2014-YY-023)
National Key R&D Program of China (2017YFC0907000)
Priority Academic Program Development of Jiangsu Higher Education Institutions (PAAD)
Scientific Research Innovation Project for Graduate Students in Jiangsu Province (KYCX17_1293)
Social Development Project in Jiangsu Province (BE2015694)
Text and Data Mining valid from 2018-09-12
Received: 6 June 2018
Accepted: 4 September 2018
First Online: 12 September 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Nanjing Medical University. After informed consent was obtained from all participants, questionnaires were used to collect demographic data.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.