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Contributors FS: study concept and design, drafting and revising of manuscript, acquisition and interpretation of data. SM: data acquisition, revising the manuscript critically for content, study supervision. SAH: genetic test for HD in Oman, data and DNA collection, revising and approval of manuscript. QAS: data acquisition accuracy, logistic support at Royal Hospital, critical review and approval of the manuscript. BD: data acquisition accuracy and integrity, critical review and approval of the manuscript. GC: reviewed the epidemiological study design and provided critical review and approval of the manuscript. TM: designed statistical analysis, was involved in the data analysis and provided critical review of the manuscript. All authors gave final approval of the version to be published.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests FS provided consulting services and advisory board functions to Teva, Pfizer, Hoffmann-La Roche, Novartis, PTC Therapeutics, UCB, Oman Ministry of Health - Sultanate of Oman. He is cofounder, scientific officer and consultant of the not-for-profit organisation Italian League for Research on Huntington disease (LIRH Foundation).
Patient consent for publication Not required.
Ethics approval Institutional Review Board of LIRH Foundation (Prot. 1.050219/mob) and Ethical Committee, Directorate General of the Royal Hsopital, Ministry of Health, Muscat, Sultanate of Oman (reference number: SRC#31/2020).
Provenance and peer review Not commissioned; externally peer reviewed.