Niu, Yushuo
Liu, Ting
Ran, Ni
Li, Kuinan
Sun, Yaru
Wang, Xin
Guo, Kun
Yang, Xiuling
Article History
Received: 28 March 2022
Accepted: 26 July 2022
First Online: 1 August 2022
Declarations
:
: The study was approved by the Research Ethics Board of the Affiliated Hospital of Qingdao University, Qingdao, China (QYFY WZLL 25896). All the experiment protocol for involving humans was in accordance to guidelines of Declaration of Helsinki in the manuscript. Written informed consent was obtained from the parents after providing details of the survey and all concerns answered, before the questionnaire was introduced.
: Not applicable.
: All authors declare that they have no competing interests.