1. Introduction
Noise-induced hearing loss (NIHL) is sensory neural hearing loss
due to exposure to intense impulse or continuous sound. Exposure
to noise can be occupational or nonoccupational. The audiologic
profile of NIHL is the presence of sensorineural hearing loss that is
most pronounced in the high-frequency region between 3,000 Hz
and 6,000 Hz of the audiogram, and the greatest amount of hearing
loss is typically around the 4,000-Hz region (i.e., 4,000 Hz dip) [1].
The World Health Organization (WHO) currently estimates that
250 million people worldwide have disabling hearing loss of
moderate to profound severity [2]. Adult-onset hearing loss ranks
1. IntroductionNoise-induced hearing loss (NIHL) is sensory neural hearing lossdue to exposure to intense impulse or continuous sound. Exposureto noise can be occupational or nonoccupational. The audiologicprofile of NIHL is the presence of sensorineural hearing loss that ismost pronounced in the high-frequency region between 3,000 Hzand 6,000 Hz of the audiogram, and the greatest amount of hearingloss is typically around the 4,000-Hz region (i.e., 4,000 Hz dip) [1].The World Health Organization (WHO) currently estimates that250 million people worldwide have disabling hearing loss ofmoderate to profound severity [2]. Adult-onset hearing loss ranks
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