Randomization, permuted blocks, masking, allocation concealment, and selection bias in the Tobacco Quit Line Study.
Berger
Vance W
VW
D004311:Double-Blind Method; D006801:Humans; D011897:Random Allocation; D012107:Research Design; D015983:Selection Bias; D016037:Single-Blind Method; D016540:Smoking Cessation / Q000379:methods*