Funding for this research was provided by:
National Natural Science Foundation of China (81771825)
Beijing Municipal Science and Technology Commission (D171100003017003)
Ministry of Science and Technology of China (2017YFC1307904)
Text and Data Mining valid from 2018-11-06
Received: 12 May 2018
Accepted: 26 October 2018
First Online: 6 November 2018
Compliance with ethical standards
: This study was funded by grants from the National Natural Science Foundation of China (81771825, 81720108022, 91649116, 81571040), the Beijing Municipal Science and Technology Project (D171100003017003) and the Ministry of Science and Technology of China (2017YFC1307904).
: The authors declare that they have no conflict of interest.
: We declare that 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.
: Informed consent was obtained from all individual participants included in the study.