1. Copenhagen University Hospital, Frederiksberg, Denmark, and Copenhagen University Hospital at GlostrupGlostrupDenmark
2. Copenhagen University HospitalFrederiksbergDenmark
3. University of Copenhagen Hospital at KøgeKøgeDenmark
4. Ambroise‐Paré Hospital, AP‐HPBoulogne‐BillancourtFrance
5. Sapienza Università di RomaRomeItaly
6. Hospital General Universitario Gregorio MarañónMadridSpain
7. National Institute of Rheumatology and PhysiotherapyBudapestHungary
8. University of Leeds and Chapel Allerton HospitalLeedsUK
9. Copenhagen University Hospital at GlostrupGlostrupDenmark