Flynn, J
Jones, J
Johnson, A J
Andritsos, L
Maddocks, K
Jaglowski, S
Hessler, J
Grever, M R
Im, E
Zhou, H
Zhu, Y
Zhang, D
Small, K
Bannerji, R
Byrd, J C
Article History
Received: 30 August 2014
Revised: 8 November 2014
Accepted: 11 December 2014
First Online: 24 February 2015
Competing interests
: Conflict-of-interest disclosure: EI, HZ, YZ and KS are employees of Merck & Co., Inc. RB was an employee of Merck & Co., Inc., at the time of this study.