Funding for this research was provided by:
National Natural Science Foundation of China (81672865, 81472667, 81461148021)
Received: 23 November 2018
Accepted: 22 January 2019
First Online: 11 February 2019
Ethics approval and consent to participate
: This study was conducted in accordance with ethical standards and according to the national and international guidelines. All animal studies were approved by the Institutional Animal Care and Use Committees of Tsinghua University (project number: 14-LYZ1) and performed according to the guidelines of the Experimental Animals Management Committee.
: All authors consent to publish.
: The authors declare that they have no competing interests.
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