Funding
This work was supported by grants from AFA Research Funding No. 120216 and No. 190264, the Eurospine Research Grants No TFR 8-2014, the Swedish Research Council (VR) No 2015-02511, the Health and Medical Care Executive Board of the Västra Götaland Region (VGR) and Doctor Felix Neubergh grants.Open access funding provided by Sophiahemmet University College.