Prevalence and predictors of hair pulling disorder and excoriation disorder in Tourette syndrome.

Greenberg E, Tung ES, Gauvin C, Osiecki L, Yang KG, Curley E, Essa A, Illmann C, Sandor P, Dion Y, Lyon GJ, King RA, Darrow S, Hirschtritt ME, Budman CL, Grados M, Pauls DL, Keuthen NJ, Mathews CA, Scharf JM.