Funding for this research was provided by:
the Major scientific and technological projects of medical and health in Zhejiang Province (WKJ-ZJ-2032)
Received: 26 December 2019
Accepted: 8 May 2020
First Online: 11 June 2020
Ethics approval and consent to participate
: The trial protocol, informed consent forms, and other requested documents have been reviewed and approved by the Central Ethics Committee of Women’s Hospital School of Medicine, Zhejiang University (case number: 20180155). We will not begin recruiting at other centers in the trial until local ethical approvals have been obtained. The progress and the safety of the study will be accessed every 6 months by the Central Ethics Committee of Women’s Hospital School of Medicine, Zhejiang University. The written consent will be obtained from all participants. The trial was registered at Chinese Clinical Trial Registry on 23 January 2019 (ID: ChiCTR1900020970). Important protocol modifications will be communicated to these agencies. We respect the parents’ decisions to join or leave the study at any time.
: The parents will sign the consent for publication.
: The authors declare that they have no competing interests.