Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (7172106)
National Key R&D Plan (2016YFC1000702)
Text and Data Mining valid from 2018-10-29
Received: 16 August 2018
Accepted: 16 October 2018
First Online: 29 October 2018
Compliance with ethical standards
: Huijun Zhao, Juan Ma, Ting Lei, Wanru Ma, Man Zhang declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.