1. Rheumatology Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
2. School of Technology and Management, Polytechnic Institute of Viseu, Viseu, Portugal
3. Centre for the Study of Education, Technologies and Health, Viseu, Portugal
4. Centre for Mathematics, University of Coimbra, Coimbra, Portugal
5. Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, Coimbra, Portugal
6. Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal