Xu, Wei
Flores-Mireles, Ana L.
Cusumano, Zachary T.
Takagi, Enzo
Hultgren, Scott J.
Caparon, Michael G.
Article History
Received: 11 July 2017
Revised: 27 September 2017
Accepted: 3 October 2017
First Online: 6 November 2017
Competing interests
: The authors declare no competing financial interests.