Funding for this research was provided by:
The General Programs of National Natural Science Foundation of China (81271053)
The National Natural Emergency management project (81450026)
Text and Data Mining valid from 2019-07-15
Received: 7 May 2018
Accepted: 12 June 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: Approval was obtained from the Institutional Review board of PUMCH and written informed consent was obtained from each studied family member.
: Consent for publication of individuals’ details was obtained from each subjects or their parents.
: The authors declare that they have no competing interests.