1 Austrian Association for Quality Assurance and Standardization of Medical and Diagnostic Tests, Vienna 1090, Austria. Electronic address: christoph.buchta@oequasta.at.
2 INSTAND Society for Promoting Quality Assurance in Medical Laboratories, Düsseldorf, Germany; Institut für Qualitätssicherung in der Virusdiagnostik, Berlin, Germany; Gesellschaft für Biotechnologische Diagnostik, Berlin, Germany.
3 Austrian Association for Quality Assurance and Standardization of Medical and Diagnostic Tests, Vienna 1090, Austria.
4 INSTAND Society for Promoting Quality Assurance in Medical Laboratories, Düsseldorf, Germany.
5 INSTAND Society for Promoting Quality Assurance in Medical Laboratories, Düsseldorf, Germany; Gesellschaft für Biotechnologische Diagnostik, Berlin, Germany.