Funding for this research was provided by:
shandong provincial key research and development program (2018GGX109002)
Article History
Received: 6 July 2021
Accepted: 20 September 2021
First Online: 27 September 2021
Declarations
:
: This study was approved by ethics committee on scientific research of Shandong University Qilu Hospital (KYLL-2017-612). Informed consent was acquired from all children’s parents.
: Not applicable.
: The authors declare that they have no competing interests.