1 Department of Clinical Genetics, Sheffield Children's Hospital, Sheffield, UK.
2 Struthers Parkinson's Center, Minneapolis, Minnesota, USA.
3 Departments of Psychiatry, Pediatrics, & Neurology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.
4 George-Huntington-Institute & Department of Radiology, University of Muenster, Muenster, Germany.
5 Department for Neurodegeneration, Hertie Institute for Clinical Brain Research, University of Tuebingen, Tuebingen, Germany.
6 Department of Neurology, Maastricht University Medical Center, Maastricht, The Netherlands.
7 Department of Neurodegenerative Disease, University College London Institute of Neurology, University College London, London, UK.
8 Department of Neurology, Huntington Centre NRW, Ruhr-University Bochum, St. Josef-Hospital, Bochum, Germany.
9 Department of Neurology, Leiden University Medical Center Neurology, Leiden, The Netherlands.
10 Huntington and Rare Diseases Unit, Fondazione Instituto Di Ricovero e Cura a Carattere Scientifico Casa Sollievo della Sofferenza Research Hospital, San Giovanni Rotondo, Italy.
11 Department of Neurology, University of Ulm, Ulm, Germany.
12 Swiss HD Center, Neurozentrum Siloah and Department of Neurology, University of Bern, Bern, Switzerland.