Funding for this research was provided by:
National Natural Science Foundation of China (31820103014)
Higher Education Discipline Innovation Project (D20008)
Article History
Received: 9 March 2022
Accepted: 10 May 2022
First Online: 17 May 2022
Declarations
:
: This study was approved by the Ethics Committee of the Faculty of Veterinary Medicine, Mansoura University, Egypt. All parents or guardians of the children were informed of the objective of the survey and were asked to voluntarily participate in the study. Informed consent was obtained from the legal guardians of the participants before the sample and data collection.
: Not applicable.
: The authors declare no competing interests.