; (7) training and certifying opioid use disorder treatment providers, including physicians, nurses, counselors, social workers, care coordinators, and case managers; (8) supporting innovative delivery of medication-assisted treatment; and (9) enhancing prevention using evidence-based methods proven to reduce the number of persons with opioid use disorders. (b) Priority In awarding grants under this subsection, the Director shall prioritize grants to Federally qualified health centers, substance abuse treatment centers and programs, rehabilitation treatment centers and programs, and residential treatment centers— (1) serving communities with a greater incidence of substance abuse; or (2) providing, or proposing to incorporate, medication-assisted treatment. (c) Requirements (1) Evidence-based, cost-effective Services funded through a grant under this subsection shall be— (A) evidence-based; and (B) cost-effective. (2) Manner of providing services Services funded through a grant under this section— (A) may be provided by the grantee directly or through referrals to other providers with which the grantee has a formal relationship