Emergence of an early SARS-CoV-2 epidemic in the United States - Zeller, Mark; Gangavarapu, Karthik; Anderson, Catelyn; Smither, Allison R.; Vanchiere, John A.; Rose, Rebecca; Snyder, Daniel J.; Dudas, Gytis; Watts, Alexander; Matteson, Nathaniel L.; Santos Júnior, Gilberto Sabino dos (Cell, 2021)