Genetic and environmental influences on child reports of manifest anxiety and symptoms of separation anxiety and overanxious disorders: a community-based twin study.
Topolski TD, Hewitt JK, Eaves LJ, Silberg JL, Meyer JM, Rutter M, Pickles A, Simonoff E. Genetic and environmental influences on child reports of manifest anxiety and symptoms of separation anxiety and overanxious disorders: a community-based twin study. Behav Genet. 1997 Jan; 27(1):15-28.