Sibling Comparison Designs to Assess Social Exposures and Empirical Tools to Guide Interpretation: An Illustrative Study of Childhood Income and Subsequent Mental Disorders. - Ejlskov L; Esen BÖ; Formánek T; Hakulinen C; Weye N; McGrath JJ; Pedersen CB; Plana-Ripoll O (Epidemiology (Cambridge, Mass.), 2026)