Correction.

In the letter to the Editor titled "When to Use the Manipulation?" by Richard E Erhard, PT, DC, in the January 2003 issue, the following reference was omitted from the end of the final paragraph:

Flynn T, Fritz JM, Whitman J, et al. A clinical prediction rule for classifying patients with low back pain who demonstrate short-term improvement with spinal manipulation. Spine. 2002;27:2835-2843.

The Journal regrets the error.