Funding for this research was provided by:
the Key Basic Research Program of the Ministry of Science and Technology of China (2013FY114100)
CAMS Innovation Fund for Medical Sciences (2016-I2M-2-004)
CAMS Innovation Fund for Medical Science (2018-I2M-1-001)
Received: 7 June 2019
Accepted: 18 October 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences. All participants provided written informed consent.
: Not available.
: The authors declare that they have no competing interests.