Daley, A., Riaz, M., Lewis, S., Aveyard, P., Coleman, T., Manyonda, I., West, R., Lewis, B., Marcus, B., Taylor, A., Ibison, J., Kent, A., & Ussher, M. (2018). Physical activity for antenatal and postnatal depression in women attempting to quit smoking: randomised controlled trial. BMC Pregnancy and Childbirth, 18, https://doi.org/10.1186/s12884-018-1784-3