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Vasseljen O, Unsgaard-Tøndel M, Westad C, Mork PJ.Vasseljen O, et al. Among authors: mork pj.Spine (Phila Pa 1976). 2012 Jun 1;37(13):1101-8. doi: 10.1097/BRS.0b013e318241377c.Spine (Phila Pa 1976). 2012.PMID: 22146280Clinical Trial.