1 Rheumatology and Metabolic Bone Diseases Department, Hospital de Santa Maria, Unidade Local de Saúde de Santa Maria, Lisbon Academic Medical Center, Lisbon, Portugal.
2 Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal.
3 Department of Rheumatology and Clinical Immunology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, Germany.