Wang, Haipeng
Jin, Yinzi
Wang, Dan
Zhao, Shichao
Sang, Xingang
Yuan, Beibei
Funding for this research was provided by:
National Natural Science Foundation of China (71403008)
Shandong University (IFYT18033)
Article History
Received: 28 July 2019
Accepted: 8 January 2020
First Online: 15 January 2020
Ethics approval and consent to participate
: This study has been approved by the Ethics Committee of Peking University Health Science Center (code of ethics: PKU201412128). Informed consents were obtained from all participants prior to questionnaire administration.
: Not applicable.
: The authors declare that they have no competing interests.