The Secretary of Veterans Affairs shall ensure that research is conducted at Department of Veterans Affairs facilities on the prevention and treatment of tinnitus. Such research shall include—
(1)
an assessment of the efficacy of multidisciplinary tinnitus treatment modalities on different subsets of patients;
(2)
studies on the underlying etiology of tinnitus in veteran populations that occur as a result of different causal factors, including blast-related tinnitus where there is no measurable hearing loss versus other forms of noise-induced tinnitus where there is hearing loss; and
(3)
a study of the underlying mechanisms between hearing loss and tinnitus, including cases in which one or the other condition is present, but not both.