Funding for this research was provided by:
the Ethics Committee of Beijing Friendship Hospital affiliated to the Capital Medical University (No.2018-P2-203-02)
Article History
Received: 19 November 2020
Accepted: 25 July 2021
First Online: 2 August 2021
Declarations
:
: This study was approved by the Ethics Committee of Beijing Friendship Hospital affiliated to the Capital Medical University (No. 2018-P2-203-02). The infants' parents (or responsible relative) gave written informed consent.
: All authors of this manuscript provided consent for publication.
: The authors declared no competing interests.