Liao, Bolin http://orcid.org/0000-0002-0898-0803
Maznev, A. A.
Nelson, Keith A.
Chen, Gang http://orcid.org/0000-0002-3968-8530
Article History
Received: 29 March 2016
Accepted: 5 September 2016
First Online: 12 October 2016
Competing interests
: The authors declare no competing financial interests.