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, a 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.