Price, Olivia H, Kylie S Carville, and Sheena G Sullivan. “Right Sizing for Vaccine Effectiveness Studies: How Many Is Enough for Reliable Estimation? ”. Communicable Diseases Intelligence 43 (May 15, 2019). Accessed April 5, 2026. https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/589.