Anticytokeratin (CAM5.2) reagent identifies cytokeratins 7 and 8, not cytokeratin 18.

prior walks, then one would expect less of a difference between the fast and far walks when the far test was performed fi rst. To further test this hypothesis, we revisited the order sequence of the far and the fast walks and identifi ed those who performed the fast test fi rst (n 5 8) or the far test fi rst (n 5 6) and then evaluated the difference between the fast and the far walks for the individual subjects ( Table 2 ). Although the numbers are small, outperformance with the fast instruction appears to be consistent regardless of the order of the tests. Therefore, based on this subgroup analysis, we feel that 15 min of rest is suffi cient. We thank Dr Vanjare and colleagues for their interest in our article and for fostering this discussion, which has enabled us to provide further insight into the performance of this conceptually simple, yet remarkably controversial, test.