Avianningsih, Reformia, et al. “Preliminary Study of Blood Pressure and Arterial Stiffness Monitoring Using the Niva Device (non-Invasive Vascular Analyzer)”. Science Midwifery, vol. 13, no. 6, Jan. 2026, pp. 1486-94, doi:10.35335/midwifery.v13i6.2212.