Funding for this research was provided by:
National Natural Science Foundation of China (81372587; 81171886)
Beijing Municipal Natural Science Foundation (7132018)
Beijing City Board of Education Development Project (KZ201310025021)
Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges under Beijing Municipality (IDHT20140514)
Received: 26 January 2018
Accepted: 23 April 2018
First Online: 2 May 2018
: All animal experiments were performed in accordance with the guidelines of the Animal Care and Use Committee of Capital Medical University, Beijing, China (2006–0009), and conformed to the Guide for the Care and Use of Laboratory Animals published by the National Institutes of Health (NIH Publications No. 8023, revised 1978).
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.