Key points are not available for this paper at this time.
Mead C. Killion, PhD, is President of Etymotic Research, Adjunct Professor of Audiology at Northwestern University, and Visiting Professor of Audiology at Rush University. Patricia A. Niquette, MA, is Research Audiologist at Etymotic Research. Correspondence to the authors at Etymotic Research, 61 Martin Lane, Elk Grove Village, IL 60007.
Killion et al. (Wed,) studied this question.