We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleA study of genetic and environmental effects on the co-occurrence of problem behaviors in three-year-old twins.AuthorsVan den Oord, Edwin J. C. G.; Boomsma, Dorret I.; Verhulst, Frank C.PublicationJournal of Psychopathology and Clinical Science, 2000, Vol 109, Issue 3, p360ISSN0021-843xPublication typearticleDOI10.1037/0021-843X.109.3.360