Psychological Medicine, 47(6), 1085-1096. Cambridge University Press Psychological Medicine, 47(6), 1085. NLM (Medline) Rodrigues Zilhao Nogueira, N, Olthof, M C, Smit, D J A, Cath, D C, Ligthart, L, Mathews, C A, Delucchi, K, Boomsma, D I & Dolan, C V 2017, ' Heritability of tic disorders : a twin-family study ', Psychological Medicine, vol. 47, no. 6, pp. 1085-1096 . https://doi.org/10.1017/S0033291716002981 Psychological medicine, 47(6), 1085-1096. Cambridge University Press Psychological medicine, vol 47, iss 6