Ni, George http://orcid.org/0000-0003-4337-4187
Li, Gabriel
Boriskina, Svetlana V.
Li, Hongxia
Yang, Weilin
Zhang, TieJun http://orcid.org/0000-0001-9102-0178
Chen, Gang
Article History
Received: 10 February 2016
Accepted: 20 July 2016
First Online: 22 August 2016
Competing interests
: The authors have applied for a patent for this technology, but have no other competing interests.