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Janssen MM, Vincken KL, van Raak SM, Vrtovec T, Kemp B, Viergever MA, Bartels LW, Castelein RM.Janssen MM, et al. Among authors: van raak sm.Spine J. 2013 Dec;13(12):1789-800. doi: 10.1016/j.spinee.2013.05.030. Epub 2013 Jun 29.Spine J. 2013.PMID: 23819971