Hao, Qian
Zhao, Qi http://orcid.org/0000-0001-7945-6649
Article History
Received: 30 January 2021
Accepted: 8 April 2021
First Online: 5 May 2021
Declarations
:
: The authors declare that they no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the second hospital of Dalian Medical University and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consents were obtained from the subjects after explanation of the nature of the study.
: The parents of patients agreed to collect and publish the data of their children.