For research projects it may be necessary to collate information from the register with that of data from the hospital journals, health surveys, other health registers or other official administrative registers or systems. More information about the aim of the different collations may be found at our website, as the projects are initiated. Potential registers which data from the Norwegian Arthritis Register may be collated with: NOKBIL (Norwegian Quality Register for Biologic drugs) Medical Birth Registry Cause of Death Registry Cancer Registry of Norway Norwegian Prescription Database Norwegian Patient Register FD Trygd (Statistics Norway’s historical events database) Norwegian Armed Forces healt registry Norwegian Cardiovascular Disease Registry NORVAS (Norwegian Vasculitis Registry) GoTreatIT Norwegian MS Registry and Biobank Norwegian Immunisation Registry (SYSVAK) Norwegian Children’s Rheumatology Register (NOBAREV) National Service for Pregnancy and Rheumatic Diseases (REVNATUS) National Tuberculosis Register Norwegian Arthroplasty Register Norwegian Kidney Biopsy Registry National Chronic Obstructive Pulmonary Disease COPD registry Norwegian Tax Administration databases Registries within Statistics Norway Public health surveys: -compare health data to risk of inflammatory joint diseases, disease features, and outcomes. HUNT with biobank Tromsø survey with biobank HUSK with biobank CONOR with biobanks Regional research biobank Mid-Norway Biobank for Rheumatic Diseases of Western Norway Norwegian Surveillance System for Communicable Diseasese (MSIS) The European Community Respiratory Health Survey (ECRHS) The Respiratory Health in Northern Europe (RHINE) NOKBIL Nordic Arthroplasty Registry Association (NARA)