1Department of Rheumatology, Unidade Local de Saúde da Guarda, Guarda, Portugal
2Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, Hacettepe University, Ankara, Turkey
3Centre for Rheumatology & Department of Neuromuscular Diseases, University College London; National Institute for Health Research (NIHR) University College London Hospitals Biomedical Research Centre, University College London Hospitals NHS Foundation Trust; Department of Rheumatology, Northwick Park Hospital, London North West University Healthcare NHS Trust, London, United Kingdom