Limited Role of Bots in Spreading Vaccine-Critical Information Among Active Twitter Users in the United States: 2017–2019. - Dunn, Adam G.; Surian, Didi; Dalmazzo, Jason; Rezazadegan, Dana; Steffens, Maryke; Dyda, Amalie; Leask, Julie; Coiera, Enrico; Dey, Aditi; Mandl, Kenneth D. (American Journal of Public Health, 2020)