Calibration-free estimation algorithm for cuffless continuous blood pressure measurement based on ultrasonic devicesJiarui Tang, Haotian Lei, Tianyu Kang, Zihao Wang, Yang Yu, Ye Tian, Yixuan Wang, Hanchuan Tang, Nianguo Dong and Jianfeng ZangNatl Sci Open, 4 2 (2025) 20240014DOI: https://doi.org/10.1360/nso/20240014