Seroprevalence of SARS-CoV-2 antibodies in healthcare workers in a surgical environment. Issue 8 (21st June 2021) - De Ruyter, M L; Parkulo, M A; Harris, D M; Hedges, M S; Brinker, T M; Marquez, C P; Rubel, N C; Simon, F R L; Logvinov, I I; Li, Z; Bosch, W