1. Rheumatology Unit, Department of Medical Sciences, Università degli Studi di Ferrara, Azienda, Ospedaliero-Universitaria S. Anna , Cona, Italy
2. Centre for Rheumatology, Department of Medicine, University College London , London, UK
3. Department of Haematology, Cancer Institute, University College London , London, UK
4. Haematology Department, Concord Repatriation General Hospital , Sydney, Australia
5. Faculty of Medicine and Health, University of Sydney , Sydney, Australia
6. Department of Haematology, University College London Hospitals NHS Foundation Trust , London, UK