Spry, E A, Moreno-betancur, M, Middleton, M, Howard, L M, Brown, S J, Molyneaux, E, Greenwood, C J, Letcher, P, Macdonald, J A, Thomson, K C, Biden, E J, Olsson, C A & Patton, G C 2021, ' Preventing postnatal depression : a causal mediation analysis of a 20-year preconception cohort ', Philosophical Transactions of the Royal Society B: Biological Sciences, vol. 376, no. 1827, 20200028, pp. 20200028 . https://doi.org/10.1098/rstb.2020.0028 Philos Trans R Soc Lond B Biol Sci