Sequence Variants in Small CAG Repeat Expansions of the HTT Gene and Disease Onset and Progression in Huntington Disease. - Heinzmann A; Petit E; Dawson J; Kay C; Davoine CS; Méreaux JL; Black HF; Arning L; Nguyen HP; Coarelli G; Sayah S; Pariente J; et al. (Neurology, 2026)