Koike S, Gaysina D, Jones PB, Wong A, Richards M. Catechol O-methyltransferase (COMT) functional haplotype is associated with recurrence of affective symptoms: A prospective birth cohort study. Journal of Affective Disorders. 2018 Mar;229():437–42. doi: 10.1016/j.jad.2017.12.044.