Meng, Xianghong
Yang, Jianping
Wang, Zhi
Article History
Received: 23 December 2020
Accepted: 1 March 2021
First Online: 8 March 2021
Declarations
:
: Tianjin Hospital Ethics Committee had approved the study (Approval number: 2017医伦审018). Informed consent was obtained from all the parents of individual participants included in the study. All methods were performed in accordance with the Declaration of Helsinki.
: Not Applicable.
: The authors declare that they have no competing interests.