Tian, Yuxi
Kuzimenkova, Marina V
Xie, Mingyi
Meyer, Matthias
Larsson, Per-Olof
Scheblykin, Ivan G
Article History
Received: 16 April 2014
Revised: 22 July 2014
Accepted: 6 August 2014
First Online: 3 October 2014
Competing interests
: The authors declare no conflict of interest.