Titchenell, Paul M.
Chu, Qingwei
Monks, Bobby R.
Birnbaum, Morris J.
Article History
Received: 8 September 2014
Accepted: 1 April 2015
First Online: 12 May 2015
Competing interests
: M.J.B is an employee of Pfizer, Inc. The remaining authors declare no competing financial interests.