Funding for this research was provided by:
China National Science and Technology (2012ZX100020020042)
Peking‐Tsinghua Center for Life Sciences
National Natural Science Foundation of China (31370878)
US NIH (R01AI098995)
Natural Sciences and Engineering Research Council of Canada (RGPIN‐355350/396037)
Canadian Institutes for Health Research (MOP‐119295)
Article History
Received: 10 May 2016
Revised: 1 July 2016
Accepted: 3 August 2016
First Online: 29 August 2016
Conflict of interest
: The authors declare that they have no conflict of interest.