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Since the above article was first published online, information was omitted from the Declaration of Interest section. This has now been included in both the print and online versions, and has also been provided below.
W. Lavelle received grants from IntegraLife, DePuy, Medtronic, Vertebral Technologies, Inc. Sigmus, Inc. Spinal Kinetics, Inc. K2M, Inc, Providence Technolgies, Stryker that are outside of the submitted work.