Tracy, Cameron L.
Lang, Maik
Pray, John M.
Zhang, Fuxiang
Popov, Dmitry
Park, Changyong
Trautmann, Christina
Bender, Markus
Severin, Daniel
Skuratov, Vladimir A.
Ewing, Rodney C.
Article History
Received: 9 July 2014
Accepted: 18 December 2014
First Online: 27 January 2015
Competing interests
: The authors declare no competing financial interests.