Tandon, M.; Lessov-Schlaggar, C. N.; Tillman, R.; Hovell, M. F.; Luby, J. Secondhand Smoke Exposure and Severity of Attention-Deficit/Hyperactivity Disorder in Preschoolers: A Pilot Investigation. Scand J Child Adolesc Psychiatry Psychol 2014, 2, 37-40.