Gong, J
Weng, D
Eguchi, T
Murshid, A
Sherman, M Y
Song, B
Calderwood, S K
Article History
Received: 22 January 2014
Revised: 24 November 2014
Accepted: 25 November 2014
First Online: 9 February 2015
Competing interests
: The authors declare no conflict of interest.