Reply to "Methodological Challenges in Interpreting SAA-Defined Imaging Subgroups in Parkinson's Disease". - Chiu SY; Wang WE; Chen R; DeSimone JC; Archer DB; Adler CH; Mehta SH; Dresler SR; Armstrong MJ; McFarland N; Okun MS; Vaillancourt DE (Annals of neurology, 2026)