Optimizing Biomarkers from Earbud Ballistocardiogram: Calibration and Calibration-Free Algorithms for Accelerometer Axis Selection and Fusion.

Yunzhi Li, Md. Mahbubur Rahman, Mehrab Bin Morshed, Md Saiful Islam, Hao Zhou, Weinan Wang, Holland Ernst, Li Zhu, Jilong Kuang

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