1. RKC Centre for Spine Surgery in Stockholm, Sweden/Futurum, Academy for Health and Care, Region Jönköping County , Sweden ;
2. Department of Infectious Diseases, Institute of Biomedicine, University of Gothenburg , Sweden ;
3. Sahlgrenska University Hospital , Göteborg , Sweden ;
4. Department of Cell and Molecular Biology, Biomedical Center, Uppsala University , Sweden ;
5. Karolinska University Hospital , Stockholm , Sweden ;
6. Spine Unit, Ortopaedkirurgisk Afdeling, Sjaellands Universitetshospital , Køge , Denmark ;
7. Spine Center of Southern Denmark, Lillebaelt Hospital , Middelfart , Denmark ;
8. Spine Center Göteborg , Västra Frölunda , Sweden