Bell, M. B. V.
Cant, M. A.
Borgeaud, C.
Thavarajah, N.
Samson, J.
Clutton-Brock, T. H.
Article History
Received: 29 November 2013
Accepted: 25 June 2014
First Online: 22 July 2014
Competing interests
: The authors declare no competing financial interests.