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Long is a Professor in the Department of Psychiatry (primary) and the Department of Biostatistics (secondary), University of Iowa. James A. Mills is a biostatistician in the Department of Psychiatry, University of Iowa.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Authors\u2019 information"}},{"value":"Study activities were reviewed and approved by institutional review boards (PREDICT-HD) or local ethics committees (TRACK-HD, REGISTRY, Enroll-HD). Informed consent procedures were carried out for each participant, and signed consents for participation and the distribution of de-identified data for collaborative research were obtained.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"JDL is a paid consultant for Wave Life Sciences USA Inc., Vaccinex Inc., and Azevan Pharmaceuticals Inc. He is also a paid advisory board member for Wave Life Sciences USA Inc., F. Hoffmann-La Roche Ltd., Huntington Study Group (for uniQure biopharma B.V.), and Mitoconix Bio Limited.JAM is a paid consultant for Wave Life Sciences USA Inc.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Publisher\u2019s Note"}}],"article-number":"138"}}