Funding for this research was provided by:
Qingdao Municipal Science and Technology Bureau (17-3-3-8-nsh)
Received: 8 July 2020
Accepted: 13 October 2020
First Online: 19 October 2020
Ethics approval and consent to participate
: This article has been approved by the ethics committee of Affiliated Hospital of Qingdao University. In this study, the parents of all patients signed a preoperative informed consent form and agreed to participate in the accompanying scientific research.
: All the parents of involved children have signed the Informed Content Form before surgery. In this study, there is no any indentifying personal or clinical details along with any indentifying images to be published.
: The authors have no competing interests to disclose.