Done by the TRI.
"Our data clearly indicate differences between tinnitus patients with and without trauma at tinnitus onset.
Patients suffering from trauma-associated tinnitus suffer from a higher mental burden than tinnitus patients presenting with phantom perceptions based on other or unknown etiologic factors.
This is especially the case for patients with whiplash and head trauma.
Patients with posttraumatic noise-related tinnitus experience more frequently hyperacousis, were younger, had longer tinnitus duration, and were more frequently of male gender."
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045599
"Our data clearly indicate differences between tinnitus patients with and without trauma at tinnitus onset.
Patients suffering from trauma-associated tinnitus suffer from a higher mental burden than tinnitus patients presenting with phantom perceptions based on other or unknown etiologic factors.
This is especially the case for patients with whiplash and head trauma.
Patients with posttraumatic noise-related tinnitus experience more frequently hyperacousis, were younger, had longer tinnitus duration, and were more frequently of male gender."
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045599