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## Additional reference sources  The first Frontiers [Research Topic on Tourette syndrome](http://journal.frontiersin.org/researchtopic/4176/the-neurobiology-and-genetics-of-gilles-de-la-tourette-syndrome-new-avenues-through-large-scale-coll) was published this year, including over 30 articles on TS, many stemming from the 2015 conference in London \cite{27375411}. Thenganatt and Jankovic provided a useful review of TS \cite{Thenganatt:2016}. A comprehensive review of Provisional Tic Disorder also appeared \cite{27158458}; this diagnosis refers to children whose first tic was less than a year ago, similar to Transient Tic Disorder in earlier nosologies. A helpful overview of TS genetics \cite{27536211}, and a review of epigenetic mechanisms and how they may prove to affect TS, both  appeared in July, 2016 \cite{27536211}. mid-2016 \cite{27462201}.