[1] Univ Utrecht, Dept Clin & Hlth Psychol, Altrecht Acad Anxiety Outpatient Serv, NL-3508 TC Utrecht, Netherlands
[2] Evelina Childrens Hosp, Tourettes Clin, Guys & St Thomas Kings Hlth Partners AHSC, London, England
[3] Univ Ulm, Dept Child & Adolescent Psychiat, Ulm, Germany
[4] St George Hosp, UK Tourette SyndromeAssoc, Dept Neurol, London, England
[5] Great Ormond St Hosp NHS Trust, Tourette SyndromeClin, London, England
[6] Grp Hosp Pitie Salpetriere, AP HP, Ctr Reference Natl Syndrome Gilles de la Tourette, F-75634 Paris, France
[7] Univ Paris 06, Ctr Rech, Inst Cerveau & Moelle Epiniere, Paris, France
[8] UCL, Dept Mental Hlth Sci, London, England
[9] Univ Bari, Dept Neurol & Psychiat Sci, Bari, Italy
[10] Univ Hosp, Dept Neurol, Med Ctr, Hamburg, Germany
[11] Catania Univ, Dept Child & Adolescent Neurol & Psychiat, Catania, Italy