Torisawa, Yu-suke
Spina, Catherine S
Mammoto, Tadanori
Mammoto, Akiko
Weaver, James C
Tat, Tracy
Collins, James J
Ingber, Donald E
Article History
Received: 15 November 2013
Accepted: 4 April 2014
First Online: 4 May 2014
Competing interests
: The authors declare no competing financial interests.