id	keyword
american_scientific_journal-6663	hearing
american_scientific_journal-6663	impairment
american_scientific_journal-6663	noise
american_scientific_journal-6663	workers
american_scientific_journal-6663	hearing impairment
american_scientific_journal-6663	frequency
american_scientific_journal-6663	years
american_scientific_journal-6663	respondents
american_scientific_journal-6663	experience
american_scientific_journal-6663	loss
american_scientific_journal-6663	degree
american_scientific_journal-6663	group