The Secretary of Health and Human Services (referred to in this section as the Secretary ) shall enter into contracts under section 338B of the Public Health Service Act ( 42 U.S.C. 254l–1 ) with eligible health professionals providing substance use disorder treatment services in substance use disorder treatment facilities, as defined by the Secretary. (b) Provision of substance use disorder treatment In carrying out the activities described in subsection (a)— (1) such facilities shall be located in mental health professional shortage areas designated under section 332 of the Public Health Service Act ( 42 U.S.C. 254e )