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Sergei Kochkin, PhD is Director of Market Development and Market Research at Knowles Electronics, Inc., a past officer on the Board of Directors of the Better Hearing Institute, and current Chairman of the Market Development Committee of the Hearing Industries Association. Correspondence to Dr. Kochkin at Knowles Electronics, 1151 Maplewood Drive, Itasca, IL 60143.
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Sergei Kochkin (1999) studied this question.
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