Funding for this research was provided by:
Nanjing General Project of Medical Science and Technology Development (YKK16175)
Received: 12 January 2020
Accepted: 18 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of Children’s Hospital of Nanjing Medical University (Approval number: 2016010003–1.1). Informed consent was obtained from the legal caregiver of each participant.
: Not applicable.
: The authors declare that they have no competing interests.