Importance of anti-SARS-CoV-2 assay antigenic composition as revealed by the results of the Belgian external quality assessment (EQA) scheme., Moerman, Alena, Vernelen Kris, China Bernard, Capron Arnaud, Van Den Bossche Dorien, Mariën Joachim, Ariën Kevin K., Van Acker Jos, Delforge Marie-Luce, Reynders Marijke, et al. , Diagn Microbiol Infect Dis, 2022 Feb, Volume 102, Issue 2, (2022)