Shao, Zi-yu
Wang, Peng
Li, Pei
Sun, Yu
Li, Pei-pei
Zhu, Peng
Article History
Received: 7 May 2021
Accepted: 5 November 2021
First Online: 4 December 2021
Declarations
:
: The analysis was done based on anonymized data. The study was approved by the Ethics Committee of Anhui Medical University (no. 2015002) and written informed consent was obtained from parents of all participating infants. All procedures performed in the study were in accordance with national ethical guidelines for medical and health research involving human subjects and with the 1964 Helsinki declaration as well as its later amendments.
: Not applicable.
: The authors declare that they have no competing interests.