Luan, Haiping
Article History
Received: 25 October 2022
Accepted: 9 January 2023
First Online: 20 January 2023
Declarations
:
: This study was conducted in accordance with the declaration of Helsinki.This study was conducted with approval from the Ethics Committee of Putuo District Maternal and Child Health Hospital (Approval Number: NO.PFYLL-2021003). Written informed consent was obtained from all participants and their parent and/or legal guardian.
: Not applicable.
: All of the authors had no any personal, financial, commercial, or academic conflicts of interest separately.