Kotz, Daniel
Simpson, Colin R
Viechtbauer, Wolfgang
van Schayck, Onno CP
Sheikh, Aziz
Article History
Received: 18 November 2013
Revised: 10 January 2014
Accepted: 23 January 2014
First Online: 20 May 2014
Competing interests
: OCPS received grant money from Pfizer and Boehringer Ingelheim. AS received grant money from NAPP. DK received an unrestricted research grant from Pfizer for a smoking cessation trial. OCPS is an Assistant editor of, and AS is Joint Editor-in-Chief of, the PCRJ. Neither were involved in the editorial review of, nor the decision to publish, this article. CRS and WV have nothing to declare.