DOUGLAS WILMORE: And as you get into the systems that do more spherical kinds of counting, as DEXA really gets developed, I think you will minimize that error more and more. But what that means is you are going to have to go back and redefine your equations and redevelop your equations as the technology gets better.

KARL FRIEDL: We do not have to change them every time, but we need to keep checking on them to make sure that we are not doing something grossly inappropriate.

DOUGLAS WILMORE: You can make phantoms [models imitating body composition, used to calibrate instruments], though, and get into that without using people.