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doi: 10.1097/BRS.0b013e3180ca760a

Pfeiffer FM, Abernathie DL, Smith DE. A comparison of pullout strength for pedicle screws of different designs: a study using tapped and untapped pilot holes. Spine 2006;31:E867–70.

An author for the above article was not included. The following is the correct list of authors:

Ferris M. Pfeiffer, MS,* Dennis L. Abernathie, MD,† and Douglas E. Smith, PhD‡

From *Brenoak Labs, LLC, Columbia, Missouri; †Columbia Orthopaedic Group, Columbia, Missouri; and ‡University of Missouri at Columbia, Columbia, Missouri.

© 2007 Lippincott Williams & Wilkins, Inc.