Lewis, S. J., Araya, R., Davey Smith, G., Freathy, R., Gunnell, D., Palmer, T., & Munafò, M. (2011). Smoking Is Associated with, but Does Not Cause, Depressed Mood in Pregnancy – A Mendelian Randomization Study. Public Library of Science.

Lewis, Sarah J., Ricardo Araya, George Davey Smith, Rachel Freathy, David Gunnell, Tom Palmer, and Marcus Munafò. Smoking Is Associated With, but Does Not Cause, Depressed Mood in Pregnancy – A Mendelian Randomization Study. Public Library of Science, 2011.

Lewis, Sarah J., et al. Smoking Is Associated With, but Does Not Cause, Depressed Mood in Pregnancy – A Mendelian Randomization Study. Public Library of Science, 2011.