Yang, Yumeng
Luo, Ziyan
Wu, Haijun http://orcid.org/0000-0002-7303-379X
Xu, Yanjun
Li, Run-Wei
Pennycook, Stephen J.
Zhang, Shufeng
Wu, Yihong http://orcid.org/0000-0002-7226-7674
Funding for this research was provided by:
National Research Foundation Singapore (NRF-CRP10-2012-03)
Ministry of Education - Singapore (MOE2013-T2-2-096)
National Science Foundation (ECCS-1708180)
Article History
Received: 17 October 2017
Accepted: 17 May 2018
First Online: 8 June 2018
Competing interests
: The authors declare no competing interests.