1. Martina Hansens Hospital, Sandvika, Norway, Diakonhjemmet Hospital, and University of Oslo Oslo Norway
2. Østfold Hospital Trust, Grålum, Norway, and Diakonhjemmet Hospital Oslo Norway
3. Diakonhjemmet Hospital Oslo Norway
4. Martina Hansens Hospital Sandvika Norway
5. Østfold Hospital Trust Grålum Norway
6. Lillehammer Hospital For Rheumatic Diseases Lillehammer Norway
7. Betanien Hospital Skien Norway