See :
http://www.tinnitusformula.com/infocenter/articles/treatments/haircells.aspx
I believe much progress has been made since the 2004 aritcle. Let's await for more news.
My blog is a layman's attempt to put together information on sensorineural hearing loss cures/on its related tinnitus cures , for sufferers' comfort and for scientists/doctors/interested persons to collaborate together and not repeat experiments already done by others. All are advised to seek proper verification/advice and not to simply rely on any information here. Please e-mail me at wongtanlim3@yahoo.com to provide updates