Funding for this research was provided by:
Open Project of State Key Laboratory of Supramolecular Structure and Materials (sklssm201815)
Text and Data Mining valid from 2018-12-07
Received: 13 June 2018
Accepted: 18 October 2018
First Online: 7 December 2018
Compliance with ethical standards
: The author(s) declare that they have no competing interests.