Funding for this research was provided by:
National Natural Science Foundation of China (31500961, 31971099)
Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
National Social Science Foundation of China (15BTY023)
Science and Education Department of the General Administration of Sport of China (2017B009)
Postgraduate Research Innovation Program of Jiangsu Province ((KYCX19_0738))
Text and Data Mining valid from 2020-04-22
Received: 17 December 2019
Accepted: 17 March 2020
First Online: 22 April 2020
Ethics approval and consent to participate
: This study does not involve invasive interventions on the human body. It is only a questionnaire survey, so it was approved by the Humanities Research Ethics Committee of Nanjing Normal University (202003005). All participants read a statement that explained the purpose of the survey and provided written informed consent before participation in the study. As the relatives of the participants also provided consent. For those not willing to take part in the study, their right was respected to withdraw from the study. The study did not adversely affect the rights and welfare of the subjects and no financial compensation or provision was made.
: Not applicable.
: The authors declare that they have no competing interests.