1. Serviço de Medicina 1, Hospital de Santo André, Centro Hospitalar de Leiria, Portugal.
2. UGC de Reumatologia, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Spain.
3. Serviço de Medicina 2, Hospital Santa Maria, Centro Hospitalar Universitario Lisboa Norte, Lisbon, Portugal.
4. Centre for Rheumatology, Divsion of Medicine, University College London, UK. d.isenberg@ucl.ac.uk