Effectiveness of COVID-19 mRNA Vaccines in Preventing COVID-19-Associated Outpatient Visits and Hospitalizations Among American Indian and Alaska Native Persons, January-November 2021: A Test-Negative Case-Control Analysis Using Surveillance Data. - Lutz CS; Hartman RM; Vigil DE; Britton A; Burrage AB; Campbell AP; Close RM; Desnoyers C; Dobson J; Garcia S; Halasa N; Honie E; et al. (Open forum infectious diseases, 2023)