Multiclass Arrhythmia Classification using Smartwatch Photoplethysmography Signals Collected in Real-life Settings. - Dong Han; Jihye Moon; Luís Roberto Mercado Díaz; Darren Chen; Devan Williams; Eric Y. Ding; Khanh-Van Tran; David D. McManus; Ki H. Chon (ICASSP, 2025)