1. Gastroenterology Service, Clínica Rotger Quironsalud, Palma, Spain
2. Rheumatologist, Independent Professional, Madrid, Spain
3. Rheumatologist, Hospital Quironsalud Infanta Luisa, Sevilla, Spain
4. Rheumatologist, Hospital Universitario Quironsalud Pozuelo, Madrid, Spain
5. Rheumatologist, Hospital Quironsalud Barcelona, Barcelona, Spain
6. Dermatologist, Hospital Sagrat Cor, Barcelona, Spain
7. Medical department, Fresenius Kabi España, S.A.U, Barcelona, Spain
8. Axentiva Solutions, Barcelona, Spain
9. Department of Statistics, University of Barcelona, Barcelona, Spain