Funding for this research was provided by:
Dongguan Social development project (201950715007158)
Received: 8 April 2020
Accepted: 27 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: All procedures in this study were approved by the Committee on Ethics of the Dongguan Maternal and Child Health Care Hospital. Detailed written informed consent was obtained from all participants. In the case of children or those cognitively impaired and unable, written informed consent for participation in this study was obtained from the patients’ parents or guardians.
: Written informed consent for publication of clinical and genetic data was obtained from all participants. The parents /legal guardian of the children (under the age of 18) has signed written informed consent for publication of clinical and genetic data.
: The authors declare that they have no competing interests.