Funding for this research was provided by:
National Natural Science Foundation of China (61333003, 61703382)
China Aerospace Science and Technology Innovation Foundation (CAST.No.JZ20160008)
Text and Data Mining valid from 2019-02-11
Received: 2 May 2018
Accepted: 26 December 2018
First Online: 11 February 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.