Received: 24 March 2021
Accepted: 24 August 2021
First Online: 1 September 2021
: The current study was reviewed and approved by the Medical Ethics Committee of the Department of Medical Psychology, Army Military Medical University (No. CWS20J007). The study was conducted in accordance with the Declaration of Helsinki guidelines. The approval from officials of sampled schools was obtained in a written form. Parents or legal guardians were contacted to provide consent on behalf of the children to participate in the study. After reading the informed consent, participants can complete the following survey if they want to further participate in this study. We will try to protect participants’ privacy.
: Not applicable.
: The authors declare that they have no competing interests.