Zhang, Gu
Brady, John
Liang, Wei-Ching
Wu, Yan
Henkemeyer, Mark
Yan, Minhong
Article History
Received: 5 August 2014
Accepted: 12 February 2015
First Online: 13 April 2015
Competing interests
: G.Z., J.R., Y.W., W.-C.L. and M.Y. are Genentech employees. The remaining author declares no completing financial interest.