Ling, Shengjie
Qin, Zhao
Li, Chunmei
Huang, Wenwen
Kaplan, David L.
Buehler, Markus J.
Article History
Received: 7 February 2017
Accepted: 14 July 2017
First Online: 9 November 2017
Competing interests
: The authors declare no competing financial interests.