Funding for this research was provided by:
The Guangdong Provincial Science and Technology Department Program (No. 20150110)
Article History
Received: 14 June 2020
Accepted: 20 December 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Guangzhou Women and Children’s Medical Center (No. 2013–32). Written informed consent was obtained from each infant’s guardians.
: Not applicable.
: Not applicable.