Zhang, Jian
Zhang, Yumei
Ma, Yidi
Ke, Yalei
Huo, Shanshan
He, Liping
Luo, Wenjuan
Li, Jing
Zhao, Ai
Article History
Received: 27 July 2020
Accepted: 2 October 2020
First Online: 10 October 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Public Health Research Center of Tsinghua University (NO.THUSM/PHREC/2020400-004). The questionnaire was filled in anonymously. Informed consent was obtained by participants clicking the option on the question of “I confirm that I voluntarily participate in this survey.”
: Not applicable
: There are no competing interests that exist.