1. Sjögren Syndrome Research Group, Department of Systemic Autoimmune Diseases, Hospital Clinic, Villarroel, Barcelona
2. Primary Care Research Group, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Uni. of Barcelona, Primary Care Centre Les Corts, Barcelona
3. Department of Internal Medicine, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Hospital Clinic, University of Barcelona, Barcelona