Hornig, M https://orcid.org/0000-0001-7572-3092
Gottschalk, G
Peterson, D L
Knox, K K
Schultz, A F
Eddy, M L
Che, X
Lipkin, W I
Article History
Received: 20 November 2014
Revised: 19 January 2015
Accepted: 9 February 2015
First Online: 31 March 2015
Competing interests
: The authors declare no conflict of interest.