Huo, Jie
Wu, Xinping
Gu, Chuanli
Yu, Zhangbin
Zhang, Jun
Chen, Xiaohui
Zhu, Jingai
Liu, Feng
Liu, Beibei
Li, Qianqian
Han, Shuping http://orcid.org/0000-0003-2077-1673
Article History
Received: 23 September 2020
Accepted: 19 October 2021
First Online: 24 November 2021
Declarations
:
: Central ethics approval was obtained from The Medical Ethics Committee of Nanjing Maternity and Child Health Care Hospital (Reference No. [2020] KY-017). Ethical approval is applicable to all participating research centres.All participants will obtain written informed consent from their parents or legal guardians (Additional file InternalRef removed).
: Not applicable.
: All authors declare that there are no conflicts of interest related to this study.