Posture-Dependent Variability in Wrist Ballistocardiogram-Photoplethysmogram Pulse Transit Time: Implication to Cuff-Less Blood Pressure Tracking. - Sungtae Shin; Azin Mousavi; Sophia Lyle; Elisabeth Jang; Peyman Yousefian; Ramakrishna Mukkamala; Dae-Geun Jang; Ui-Kun Kwon; Youn Ho Kim; Jin-Oh Hahn (IEEE Trans. Biomed. Eng., 2022)