Multiclass Arrhythmia Classification Using Multimodal Smartwatch Photoplethysmography Signals Collected in Real-Life Settings. - Dong Han; Jihye Moon; Luís Roberto Mercado Díaz; Darren Chen; Devan Williams; Fahimeh Mohagheghian; Om Ghetia; Andrew G. Peitzsch; Youngsun Kong; Nishat Nishita; Ohm Ghutadaria; Taylor A. Orwig; et al. (IEEE Trans. Biomed. Eng., 2026)