1. Comings DE, Himes JA, Comings BG: An epidemiologic study of Tourette's syndrome in a single school district. J Clin Psychiatry 1990; 51:463-469.
  2. Poh W, Payne JM, Gulenc A, Efron D: Chronic tic disorders in children with ADHD. Arch Dis Child 2018; 103(9): 847–852. DOI: 10.1136/archdischild-2017-314139