Article History
Received: 30 September 2021
Accepted: 16 April 2022
First Online: 18 May 2022
Declarations
:
: The authors declare that they have no conflict of Interest.
: This retrospective chart review study involving human participants was approved by the Ethics Committee of Hangzhou Maternity and Child Care Hospital and was in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Written informed consent was obtained from the parents.
: The patients had provided their consent for publication.