Workman, E R
Haddick, P C G
Bush, K
Dilly, G A
Niere, F
Zemelman, B V
Raab-Graham, K F
Article History
Received: 4 April 2014
Revised: 20 October 2014
Accepted: 22 October 2014
First Online: 6 January 2015
Competing interests
: PCGH is employed by Genentech/Roche and may own shares in the company. This does not alter the authors’ adherence to all the journal’s policies on sharing data and materials. The remaining authors declare no conflict of interest.