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Davies, Neil M., Gemma Taylor, Amy E. Taylor, Kyla H. Thomas, Frank Windmeijer, Richard M. Martin, ja Marcus R. Munafò. "What Are the Effects of Varenicline Compared With Nicotine Replacement Therapy On Long-term Smoking Cessation and Clinically Important Outcomes? Protocol for a Prospective Cohort Study." BMJ Open 2015.

Davies, Neil M., et al. "What Are the Effects of Varenicline Compared With Nicotine Replacement Therapy On Long-term Smoking Cessation and Clinically Important Outcomes? Protocol for a Prospective Cohort Study." BMJ Open 2015.