A. Frasier, H. Guyer, L. DiGrande, R. Domanico, D. Cooney, and S. Eckman, “Design for a Mail Survey to Determine Prevalence of SARS-CoV-2 (COVID-19) Antibodies in the United States”, SRM, vol. 14, no. 2, pp. 131–139, Jun. 2020.