Funding for this research was provided by:
National Natural Science Foundation of China (61563008, 61463007)
Text and Data Mining valid from 2019-01-30
First Online: 30 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: 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.