Funding for this research was provided by:
National Natural Science Foundation of China (81301965)
National Science and Technology Major Project of China (2016ZX10004001)
Received: 15 August 2017
Accepted: 18 January 2018
First Online: 30 January 2018
Ethics approval and consent to participate
: Human blood collections were taken following approval of the Institutional Review Board of the Beijing Biotechnology Institute, and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.