Detailed descriptions of the Childhood Trauma (CT) Study (Nelson et al. 2010; Sartor et al. 2012), Comorbidity and Trauma (CAT) Study (Conroy et al. 2009; Shand et al. 2011; Nelson et al. 2013), and OZ‐ALC genome‐wide association study (GWAS) (Heath et al. 2011) methods have been reported; summaries are provided below.