Appendix e-1 HD-MAPS Co-Investigators: Alexandra Durr, MD,PhD (INSERM Hôpital de la Salpêtriére, Paris, France, HD-MAPS Investigator); Adam Rosenblatt, MD (Johns Hopkins University, USA, HD-MAPS Investigator); Luigi Frati, MD, PhD (University La Sapienza, Rome, Italy, HD-MAPS Investigator); Susan Perlman MD, (University of California Los Angeles, USA, HD-MAPS Investigator); Patrick M. Conneally, PhD (Indiana University School of Medicine, USA, HD-MAPS Investigator). HD-MAPS Contributors: Mary Lou Klimek, MA, RN (University of Calgary, Canada, HD-MAPS Coordinator); Melissa Diggin, RN, MS, GNP (Boston University School of Medicine/Boston Medical Center, USA, HD-MAPS Coordinator); Tiffany Hadzi, MPH (Boston University School of Medicine/Boston Medical Center, USA, HD-MAPS Coordinator); Ayana Duckett, BA, (Columbia University Medical Center, USA, HD-MAPS Coordinator). PREDICT-HD Contributors Anwar Ahmed, PhD (Cleveland Clinic Foundation, Cleveland, Ohio, USA, Site Investigator); Paul Allen, AASC (University of Iowa, Core IT/Management Section); David Ames, MD (The University of Melbourne, Kew, Victoria, Australia, Site Investigator); Christine Anderson, BA (University of Iowa, Core Recruitment/Retention Section); Karla Anderson, BS (University of Iowa, Program Management: Administrative); Karen Anderson, MD (University of Maryland, Psychiatric Section); Thomasin Andrews, MD, BSC, MRCP (National Hospital for Neurology and Neurosurgery, London, UK, Site Staff); John Ashburner, PhD (Functional Imaging Lab, London, Imaging Section: Administrative); Eric Axelson, BSE (University of Iowa, Imaging Section: Administrative and Surface Analysis); Elizabeth Aylward, PhD (Seattle Children's Research Institute, Steering Committee and Imaging Section: Striatal Chair); Roger A. Barker, BA, MBBS, MRCP (Cambridge Centre for Brain Repair, Cambridge, UK, Site Investigator); Katrin Barth, RN (University of Ulm, Ulm, Germany, Site Staff); Stacey Barton, MSW, LCSW (Washington University, St. Louis, Missouri, USA, Site Staff); Kathleen Baynes, PhD (University of California Davis, Sacramento, California, USA,Site Investigator); Alexandra Bea, BA (Cleveland Clinic Foundation, Cleveland, Ohio, USA, Site Staff); Erik Beall, PhD (Cleveland Clinic, Imaging Section: fMRI); Mirza Faisal Beg, PhD (Simon Fraser University, Imaging Section: Shape Analysis); Leigh J. Beglinger, PhD (University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA, Cognitive and Functional Assessment Sections); Kevin Biglan, MD (University of Rochester, Steering Committee and Motor Section co-Chair); Kristine Bjork, BA (University of Iowa, Program Management: Administrative); Steve Blanchard, MSHA (University of Iowa, Program Management: Financial, Co-Chair); Jeremy Bockholt, BS (University of Iowa, Imaging Section: Surface Analysis); Sudharshan Reddy Bommu, MS (University of Iowa, Core IT/Management Section); Bradley Brossman, MA (University of Iowa, Functional Assessment Section); Maggie Burrows, RN, BA (National Hospital for Neurology and Neurosurgery, London, UK, Site Staff); Vince Calhoun, PhD (University of New Mexico, Imaging Section: Administrative); Noelle Carlozzi, PhD (Kessler Medical Rehabilitation Research & Education Center, Functional Assessment Section,); Amy Chesire, LCSW-R, MSG (University of Rochester, Rochester, New York, USA, Site Staff); Edmond Chiu, MD (The University of Melbourne, Kew, Victoria, Australia, Site Investigator); Phyllis Chua, MD (The University of Melbourne, Kew, Victoria, Australia, Site Investigator); R.J. Connell, BS (University of Iowa, Core IT/Management Section); Carmela Connor, BP, MP, DP (Neurosciences Unit, Graylands, Selby-Lemnos & Special Care Health Services, Perth, Australia, Site Staff); Jody Corey-Bloom, MD, PhD (University of California, San Diego, Motor Section co-Chair); David Craufurd, MD (University of Manchester, UK, Site Investigator and Psychiatric Section); Stephen Cross, BA (University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA, Site Staff); Lucette Cysique, PhD (St. Vincent’s/University of Melbourne, Australia, Cognitive Section); Rachelle Dar Santos, BSc (University of British Columbia, Vancouver, British Columbia, Canada, Site Staff); Jennifer Davis, PhD (Scientific Consultants, Alpert Medical School of Brown University, Cognitive Section); Joji Decolongon, MSc (University of British Columbia, Vancouver, British Columbia, Canada, Site Staff); Anna DiPietro (Cambridge Centre for Brain Repair, Cambridge, UK, Site Staff); Nicholas Doucette, BA (University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA, Core Recruitment/Retention Section); Nancy Downing, RN, MSN (University of Iowa, Psychiatric Section); Ann Dudler (University of Iowa, Program Management: Administrative); Steve Dunn, BA (University of Iowa; Imaging Section: Administrative); Daniel Ecker, MD (University of Ulm, Ulm, Germany, Site Investigator); Eric A. Epping, MD, PhD (University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA, Steering Committee, Psychiatric Section Chair and Core Ethics Section); Diane Erickson, RN (Colorado Neurological Institute, Englewood, Colorado, USA, Site Staff); Cheryl Erwin, JD, PhD (McGovern Center for Health, Humanities and the Human Spirit, Core Ethics Section Chair); Ken Evans, PhD (Ontario Cancer Biomarker Network, BioMarkers and Psychiatric Sections); Stewart A. Factor, DO (Emory University School of Medicine, Atlanta, Georgia, USA, Site Investigator); Sarah Farias, PhD (University of California, Davis, Functional Assessment Section); Marta Fatas, BA (Hospital Ramón y Cajal, Madrid, Spain, Site Staff); Jess Fiedorowicz, MD (University of Iowa, Psychiatric Section); Ruth Fullam, BSC (University of Manchester, Manchester, UK, Site Staff); Sarah Furtado, MD, PhD, FRCPC (University of Calgary, Calgary, Alberta, Canada, Site Investigator); Monica Bascunana Garde (Hospital Ramón y Cajal, Madrid, Spain, Site Staff); Carissa Gehl, PhD (VA Medical Center, Iowa City, IA, Cognitive and Functional Assessment Sections); Michael D. Geschwind, MD, PhD (University of California San Francisco, California, USA, Site Investigator and Motor Section); Anita Goh, D.Psych (The University of Melbourne, Kew, Victoria, Australia, Site Staff); Jon Gooblar, BA (University of California San Francisco, California, USA, Site Staff); Anna Goodman, PhD (Cambridge Centre for Brain Repair, Cambridge, UK, Site Staff); Jane Griffith, RN (Westmead Hospital, Sydney, Australia, Site Staff); Mark Groves, MD (Columbia University, Psychiatric Section); Mark Guttman, MD (Centre for Addiction and Mental Health, University of Toronto, Markham, Ontario, Canada, Site Investigator); Joanne Hamilton, PhD (University of California, San Diego, Cognitive Section); Deborah Harrington, PhD (University of California, San Diego, Cognitive Section Chair); Greg Harris, BS (University of Iowa, Imaging Section: Administrative); Robert K. Heaton, PhD (University of California, San Diego, Cognitive Section); Karl Helmer, PhD (Massachusetts General Hospital, Imaging Section: DTI); Machelle Henneberry (University of Iowa, Program Management: Financial); Tamara Hershey, PhD (Washington University Cognitive Science Battery Development, Cognitive Section); Kelly Herwig, BA, MS (University of Iowa, Core Recruitment/Retention Section); Elizabeth Howard, MD (University of Manchester, Manchester, UK, Site Investigator); Christine Hunter, RN, CCRC (Baylor College of Medicine, Houston, Texas, USA, Site Staff); Joseph Jankovic, MD (Baylor College of Medicine, Houston, Texas, USA, Site Investigator); Hans Johnson, PhD (University of Iowa Hospitals and Clinics, Iowa City, IA, Steering Committee and Core IT/Management Section Chair); Arik Johnson, PsyD (University of California, Los Angeles Medical Center, Los Angeles, California, USA, Site Investigator); Kathy Jones, BS (University of Iowa, Imaging Section: Administrative); Andrew Juhl, BS (University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA, Site Staff); Eun Young Kim, MS (University of Iowa, Imaging Section: Administrative); Mycah Kimble, BA (University of Iowa, Core Recruitment/Retention Section); Pamela King, BScN, RN (University of Alberta, Edmonton, Alberta, Canada, Site Staff); Mary Lou Klimek, RN, BN, MA (University of Calgary, Calgary, Alberta, Canada, Site Coordinator); Stefan Klöppel, MD (National Hospital for Neurology and Neurosurgery, London, UK, Site Investigator); Katherine Koenig, PhD (Cleveland Clinic, Imaging Section: fMRI); Angela Komiti, BS, MA (The University of Melbourne, Kew, Victoria, Australia, Site Staff); Rajeev Kumar, MD (Colorado Neurological Institute, Englewood, Colorado, USA, Site Investigator); Douglas Langbehn, MD, PhD (University of Iowa, Steering Committee and Core Statistics Section Chair); Blair Leavitt, MDCM, FRCPC (University of British Columbia, Steering Committee and BioMarkers Section Chair); Anne Leserman, MSW, LISW (University of Iowa, Functional Assessment and Core Recruitment/Retention Sections); Kelvin Lim, MD (University of Ulm, Germany, Imaging Section: DTI); Hillary Lipe, ARNP (University of Washington and VA Puget Sound Health Care System, Seattle, Washington, USA, Site Staff); Mark Lowe, PhD (Cleveland Clinic, Imaging Section: fMRI and DTI); Vincent A. Magnotta, PhD (University of Iowa, Imaging Section: DTI Chair); William M. Mallonee, MD (Hereditary Neurological Disease Centre, Wichita, Kansas, USA, Site Investigator); Nicole Mans, BA, MS (University of California Davis, Sacramento, California, USA, Site Staff); Jacquie Marietta, BS (University of Iowa, Imaging