Funding for this research was provided by:
the National Key Research and Development Program of China, the registry study of rare diseases in children (2016YFC0901505)
Beijing Key laboratory of molecular diagnosis and study on pediatric genetic diseases (BZ0317)
Received: 11 August 2018
Accepted: 12 June 2019
First Online: 1 July 2019
Ethics approval and consent to participate
: The study was approved by Peking University First Hospital Institutional Review Board (2017(20)).
: Not applicable.
: The authors declare that they have no competing interests.