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Path diagrams of the bivariate Cholesky models for narrow diagnoses. The square frame represents the observed trait and the circle frame represents the latent variable. AC and EC stand for the additive genetic variable and unique environmental variable common to IHS MO/MA and MDD; AS and ES stand for the additive genetic variable and unique environmental variable specific to MDD. C stands for the non-unique environmental variable specific to IHS MO/MA.
