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Glintborg B, Gudbjornsson B, Krogh NS, Omerovic E, Manilo N, Holland-Fischer M, Lindegaard HM, Loft AG, Nordin H, Johnsen L, Oeftiger SF, Hansen A, Rasmussen C, Grondal G, Geirsson AJ, Hetland ML. Impact of different infliximab dose regimens on treatment response and drug survival in 462 patients with psoriatic arthritis: results from the nationwide registries DANBIO and ICEBIO. Rheumatology (Oxford) 2014; 53:2100-9. [PMID: 24939677 DOI: 10.1093/rheumatology/keu252] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVE The aim of this study was to describe dose regimens, dose escalation and clinical outcomes in TNF-α inhibitor (TNFi)-naive patients with PsA treated with infliximab in routine rheumatology care. METHODS We conducted an observational cohort study based on the nationwide Danish Rheumatologic Database (DANBIO) and Center for Rheumatology Research (ICEBIO) registries. Stratified by country, characteristics of patients treated with ≤3 mg infliximab/kg body weight, 3-5 mg/kg or ≥5 mg/kg every 8 weeks were described. Outcomes were evaluated by ACR 20%, 50% and 70% (ACR20/50/70) responses and European League Against Rheumatism good response after 6 months, disease activity after 12 months, Kaplan-Meier plots and regression analyses. RESULTS Four hundred and sixty-two patients (376 Danish, 86 Icelandic) received treatment with infliximab. In Danish patients, the starting dose was ≤3 mg/kg in 110 patients (29%), 3-5 mg/kg in 157 (42%), ≥5 mg/kg in 38 (10%) and unregistered in 71 (19%). In Icelandic patients, corresponding numbers were 64 (74%), 17 (27%), 0 (0%) and 5 (6%). Patients with a higher body weight received lower doses per kilogram. Danish patients received higher doses than Icelandic patients at baseline [median 3.1 (interquartile range 3.0-3.8) vs 2.3 (2.1-2.9) mg/kg, P < 0.05] and after 12 months [3.3 (3.0-4.5) vs 2.9 (2.2-3.5) mg/kg, P < 0.0001]. After 12 months, 58% of Danish and 66% of Icelandic patients maintained treatment. Danish patients had shorter drug survival than Icelandic patients (1183 vs 483 days). In univariate analyses stratified by country, time until dose escalation, response rates, drug survival and 1-year's disease activity were independent of starting dose. Drug survival was shorter among patients not receiving concomitant MTX. CONCLUSION In clinical practice, > 70% of Icelandic and Danish PsA patients treated with infliximab received sustained doses below the 5 mg/kg every 8 weeks recommended in international guidelines. Lower starting doses did not affect drug survival or response.
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Affiliation(s)
- Bente Glintborg
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital
| | - Bjorn Gudbjornsson
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital
| | - Niels Steen Krogh
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Emina Omerovic
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Natalia Manilo
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Mette Holland-Fischer
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Hanne M Lindegaard
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anne Gitte Loft
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Henrik Nordin
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Laura Johnsen
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Sussi Flejsborg Oeftiger
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Annette Hansen
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Claus Rasmussen
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Gerdur Grondal
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Arni Jon Geirsson
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Merete Lund Hetland
- Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital, Copenhagen, Department of Rheumatology, Vendsyssel Teaching Hospital, Hjørring, Denmark, Department of Rheumatology, Landspitali University Hospital of Iceland, Reykjavik, Iceland and Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Danish Rheumatologic Database (DANBIO), Glostrup Hospital, Glostrup, Denmark, Center for Rheumatology Research (ICEBIO), Landspitali University Hospital of Iceland, Faculty of Medicine, University of Iceland, Reykjavik, Iceland, Zitelab Aps, Department of Rheumatology, Frederiksberg Hospital, Copenhagen, Department of Rheumatology, Aalborg University Hospital, Aalborg, Department of Rheumatology, Odense University Hospital, Odense, Department of Rheumatology, Vejle Sygehus, Sygehus Lillebælt, Department of Infectious Diseases and Rheumatology, Rigshospitalet, Copenhagen, Department of Rheumatology, Helsingør and Hillerød Hospital, Hillerød, Department of Rheumatology, Køge Hospital, Køge, Department of Rheumatology, Gentofte University Hospital
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