Nat. hum. behav. Nat. hum. behav. Modelling the impact of testing, contact tracing and household quarantine on second waves of COVID-19 Aleta A. Martín-Corral D. Pastore y Piontti A. Ajelli M. Litvinova M. Chinazzi M. Dean N.E. Halloran M.E. Longini Jr I.M. Merler S. Pentland A. Vespignani A. Moro E. Moreno Y. Universidad de Zaragoza 2020 research-article