Accuracy of a smartphone application for blood pressure estimation in Bangladesh, South Africa, and Tanzania. - Charles Festo; Valerie Vannevel; Hasmot Ali; Tigest Tamrat; Getrud J. Mollel; Tsakane Hlongwane; Kaniz A. Fahmida; Kelsey Alland; María Barreix; Hedieh Mehrtash; Ronaldo Silva; Soe Soe Thwin; et al. (npj Digit. Medicine, 2023)