The Impact of Digital Technologies on Public Health in Developed and Developing Countries 18th International Conference, ICOST 2020, Hammamet, Tunisia, June 24–26, 2020, Proceedings - Jmaiel, Mohamed 1966-; Mokhtari, Mounir; Abdulrazak, Bessam; Aloulou, Hamdi; Kallel, Slim 1980- (Springer International Publishing, 2020)