1. Department of Medical Statistics; London School of Hygiene and Tropical Medicine; London UK
2. Huntington's Disease Centre, UCL Institute of Neurology; Department of Neurodegenerative Disease, University College London; London UK
3. Center for Integrative Brain Research; Seattle Children's Research Institute; Seattle Washington USA
4. Department of Medical Genetics; University of British Columbia; Vancouver British Columbia Canada
5. Brain and Spine Institute, INSERM U1127, Centre National de la Recherche Scientifique, UMR7225; Sorbonne Universités, University Pierre and Marie Curie, Paris VI UMR_S1127; Paris France
6. Assistance Publique - Hôpitaux de Paris, Genetic Department; Pitié -Salpêtrière University Hospital; Paris France
7. Department of Neurology; Leiden University Medical Centre; Leiden The Netherlands
8. CHDI Management, CHDI Foundation; Princeton New Jersey USA
9. Clinical Development, Neurodegenerative Diseases; Teva Pharmaceuticals; Malvern Pennsylvania USA
10. School of Psychological Sciences; Monash University; Melbourne Victoria Australia
11. George Huntington Institute; Muenster Germany
12. Institute for Clinical Radiology; University of Muenster; Muenster Germany
13. Department of Neurodegenerative Diseases and Hertie-Institute for Clinical Brain Research; University of Tuebingen; Tuebingen Germany
14. Department of Psychiatry; University of Iowa; Iowa City Iowa USA