1. Department of Dermatology; Instituto de Investigación Sanitaria Princesa (IIS-IP); Hospital Universitario de la Princesa; Madrid Spain
2. Independent Researcher in Health Services Research; Madrid Spain
3. Department of Internal Medicine; Instituto de Investigación Sanitaria Princesa (IIS-IP); Hospital Universitario de la Princesa, UAM; Madrid Spain
4. Department of Gastroenterology; Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM); Madrid Spain
5. Rheumatology Division; Hospital Universitario Central de Asturias; Oviedo Spain
6. Department of Dermatology; Hospital Universitari Germans Trias i Pujol; Autonomous University of Barcelona; Barcelona Spain
7. Department of Dermatology; Hospital de Manises; Valencia Spain
8. Aragonese Institute of Health Sciences; Miguel Servet University Hospital; University of Zaragoza; Zaragoza Spain