Tandon, M., C. N. Lessov-Schlaggar, R. Tillman, M. F. Hovell, and J. Luby. “Secondhand Smoke Exposure and Severity of Attention-Deficit/Hyperactivity Disorder in Preschoolers: A Pilot Investigation”. Scandinavian Journal of Child and Adolescent Psychiatry and Psychology, vol. 2, no. 1, Apr. 2014, pp. 37-40, https://tidsskrift.dk/sjcapp/article/view/16688.