Yu, Xiao-Dong http://orcid.org/0000-0001-8835-5524
Shang, Jiangwei http://orcid.org/0000-0002-2332-5882
Gühne, Otfried http://orcid.org/0000-0002-6033-0867
Funding for this research was provided by:
National Natural Science Foundation of China (11805010)
Beijing Institute of Technology Research Fund Program for Young Scholars
CSC-DAAD postdoc scholarship
Article History
Received: 16 July 2019
Accepted: 13 November 2019
First Online: 6 December 2019
Competing interests
: The authors declare no competing interests.