Wang, Fengxue
Han, Jinyan
Shang, Xiaohong
Li, Guimei
Article History
Received: 10 April 2019
Accepted: 4 November 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: The study has gotten formal approval from the Medical Ethics Committee of Shandong Provincial Hospital affiliated to Shandong University (the committee’s reference number is 3701047149453). Patients or their parents or legal guardians provided verbal consent for their non-identifiable data to be collated and analyzed within this study on their behalf.
: Not applicable.
: The authors declare that they have no competing interests.