a Istituto Neurologico Carlo Besta, Milan, Italy;
b Universita ` Cattolica del Sacro Cuore, Milan, Italy;
c Department of Neurodegenerative Diseases, Hertie-Institute for Clinical Brain Research, University of Tubingen, Germany;
d Institute of Neurology, University College London, Queen Square, London, UK;
e Hacettepe University Hospitals, Department of Neurology, Ankara, Turkey;
f Department of Neurosurgery,Medical School Hannover, MHH, Hannover, Germany;
g European Dystonia Federation, Brussels, Belgium; and
h Neurology Department, Hospital Clı´nic, Barcelona, Spain