Han, Myung-Geun
Marshall, Matthew S.J.
Wu, Lijun
Schofield, Marvin A.
Aoki, Toshihiro
Twesten, Ray
Hoffman, Jason
Walker, Frederick J.
Ahn, Charles H.
Zhu, Yimei
Article History
Received: 10 November 2013
Accepted: 15 July 2014
First Online: 18 August 2014
Competing interests
: The authors declare no competing financial interests.