Karl Fagerström, Hans Gilljam, Michael Metcalfe, Serena Tonstad, Michael Messig
Fagerström K, Gilljam H, Metcalfe M, Tonstad S, Messig M.
Stopping smokeless tobacco with varenicline: randomised double blind placebo controlled trial
BMJ 2010; 341 :c6549
doi:10.1136/bmj.c6549