Marc Lipsitch. (2021, August 5). @nataliexdean @CT_Bergstrom N serology at end of follow up could solve problem of bias from unobserved infections https://t.co/Dwwxh77zP2 [Tweet]. @mlipsitch. https://twitter.com/mlipsitch/status/1423107107558084608

Aspelund, K. M., Droste, M. C., Stock, J. H., & Walker, C. D. (2020). Identification and Estimation of Undetected COVID-19 Cases Using Testing Data from Iceland (Working Paper No. 27528; Working Paper Series). National Bureau of Economic Research. https://doi.org/10.3386/w27528