Olofsdotter, S., S. Vadlin, K. Sonnby, T. Furmark, and K. W. Nilsson. “Anxiety Disorders Among Adolescents Referred to General Psychiatry for Multiple Causes: Clinical Presentation, Prevalence, and Comorbidity”. Scandinavian Journal of Child and Adolescent Psychiatry and Psychology, vol. 4, no. 2, Mar. 2016, pp. 55-64, https://tidsskrift.dk/sjcapp/article/view/22187.