Here you'll find a few articles I found.
http://www.slate.com/articles/life/shopping/2005/05/the_sound_of_silence.single.html#pagebreak_anchor_3
http://www.medicinenet.com/noise_induced_hearing_loss_and_its_prevention/page5.htm
http://www.dailymail.co.uk/health/article-1202116/Five-best--earplugs.html
http://www.actiononhearingloss.org.uk/loud-music/what-earplugs-and-headphones-should-i-buy.aspx
http://answers.webmd.com/answers/1176154/how-effective-are-hearing-protection-devices
http://www.slate.com/articles/life/shopping/2005/05/the_sound_of_silence.single.html#pagebreak_anchor_3http://www.medicinenet.com/noise_induced_hearing_loss_and_its_prevention/page5.htm
http://www.dailymail.co.uk/health/article-1202116/Five-best--earplugs.html
http://www.actiononhearingloss.org.uk/loud-music/what-earplugs-and-headphones-should-i-buy.aspx
http://answers.webmd.com/answers/1176154/how-effective-are-hearing-protection-devices
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