Funding for this research was provided by:
National Natural Science Foundation of China (81601583)
Text and Data Mining valid from 2018-12-14
Received: 20 August 2018
Accepted: 3 December 2018
First Online: 14 December 2018
Compliance with ethical standards
: This study was funded by the Natural Science Foundation of China Program (Project No. 81601583).
: The authors declare that they have no conflict of interest.
: All procedures performed in the 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.