Footnotes

• Handling editor Josef S Smolen

• Contributors XB and JD designed the study. DD analysed the data. MM, DR, UL, FH, WS and NO helped with the analyses. All authors reviewed the manuscript and provided input.

• Funding This study was funded by Euroimmun AG, Inova Diagnostics, Medipan GmbH, Orgetec Diagnostika GmbH, Thermo Fisher Scientific.

• Competing interests XB has received speaker fees from Thermo Fisher Scientific and Inova, has been a consultant for Thermo Fisher Scientific and Inova and has received research support from Thermo Fisher Scientific. JD has received speaker fees from Thermo Fisher Scientific, Euroimmun and Inova. MM is employed by Inova Diagnostics, WS received personal fees from Euroimmun, NO is employed by Thermo Fisher Scientific, FH and UL are employed by Orgentec, DR received personal fees from Medipan and Generic Assays.

• Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting or dissemination plans of this research.

• Patient consent for publication Not required.

• Provenance and peer review Not commissioned; externally peer reviewed.