Funding for this research was provided by:
The Swedish Research Council (521-13-3377)
The Swedish Rheumatism Association (R757921, R-844801)
King Gustav V 80-year foundation (FAI-2017-0373, FAI-2018-0504)
ALF grants provided byt the Uppsala County Council (NA)
Agnes och Mac Rudbergs Stiftelse (NA)
The Ulla and Roland Gustafsson Foundation (2019-12)
Professor Nanna Svartz Foundation (2018-00250)
The Brunnberg Foundation (NA)
Region Östergötland (NA)
Received: 24 June 2019
Accepted: 8 November 2019
First Online: 29 November 2019
Ethics approval and consent to participate
: Written informed consent was obtained from all study participants, except for the blood donor controls, where oral consent had been obtained. The study was performed in compliance with the Helsinki Declaration, and the study protocol was approved by the regional ethics review boards in Stockholm, Lund, Linköping, and Uppsala.
: The authors declare that they have no competing interests.