Further evidence for family-genetic risk factors in attention deficit hyperactivity disorder. Patterns of comorbidity in probands and relatives psychiatrically and pediatrically referred samples. - Biederman,J.; Faraone,S.V.; Keenan,K.; Benjamin,J.; Krifcher,B.; Moore,C.; Sprich-Buckminster,S.; Ugaglia,K.; Jellinek,M.S.; Steingard,R. (Arch Gen Psychiatry, 1992)