1. American Speech–Language–Hearing Association 1997–2013 Tinnitus triage guidelines. [Online] Available at: www.asha.org/aud/Articles/Tinnitus-Triage-Guidelines. Accessed December 2013
2. American Tinnitus Association 2013. http://ata.org
3. Hearing impairment as a determinant of function in the elderly;Bess;J Am Geriatr Soc,1989
4. Center for Disease Control and Prevention 2013 Noise and hearing loss prevention. [Online] Available at: www.cdc.gov/niosh/topics/noise. Accessed December 2013
5. Genetic and environmental influences on self-reported reduced hearing in the old and oldest old;Christensen;J Am Geriatr Soc,2001