Funding for this research was provided by:
Beijing Nova Program (Z171100001117025)
National Natural Science Foundation of China (31530020, 81671602)
Received: 16 July 2017
Accepted: 28 December 2017
First Online: 12 February 2018
Ethics approval and consent to participate
: All the procedures involving specimens obtained from human subjects were performed under protocols approved by the Human Research Protective Committee of People’s Hospital Peking University, and all the methods were carried out in accordance with the guidelines and regulations of the Ethics Committee of People’s Hospital Peking University. Informed consent was also provided by all subjects before the study protocol was initiated.
: Not applicable.
: The authors declare that they have no competing interests.
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