MarkeTrak VI: Hearing Aid Industry Market Tracking Survey 1984-2000
MarkeTrak VI: Hearing Aid Industry Market Tracking Survey 1984-2000. Sergei Kochkin, Ph.D. Knowles Electronics, Inc. February 27, 2002. Method. National family opinion panel 80,000 households Balanced to key census variables HIA survey in 1984 used NFO All MarkeTrak surveys
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