Veldheer, S
Yingst, J
Zhu, J
Foulds, J
Article History
Received: 30 April 2015
Revised: 25 June 2015
Accepted: 2 July 2015
First Online: 9 July 2015
Competing interests
: JF has done paid consulting for pharmaceutical companies involved in producing smoking cessation medications including GSK, Pfizer, Novartis, J&J and Cypress Bioscience. The other authors have no conflict of interest to declare.