Landgraf, Kyle E
Steffek, Micah
Quan, Clifford
Tom, Jeffrey
Yu, Christine
Santell, Lydia
Maun, Henry R
Eigenbrot, Charles
Lazarus, Robert A
Article History
Received: 2 October 2013
Accepted: 17 April 2014
First Online: 25 May 2014
Competing interests
: All authors are, or were while the research was conducted, employees of Genentech, Inc.