Data and Digital Solutions to Support Surveillance Strategies in the Context of the COVID-19 Pandemic. - Patty Kostkova; Francesc Saigí Rubió; Hans Eguia; Damian Borbolla; Marieke Verschuuren; Clayton Hamilton; Natasha Azzopardi-Muscat; David Novillo-Ortiz (Frontiers Digit. Health, 2021)