; (6) employers and purchasers; (7) health facility and system leaders, including both hospital and birth center facilities; (8) journalists; and (9) bibliographic informatics specialists. (f) Authorization of appropriations There is authorized to be appropriated $2,500,000 for each of the fiscal years 2021 through 2023 for the purpose of developing the database and such sums as may be necessary for each subsequent fiscal year for updating the database and providing outreach and notification to users, as described in this section. 518. Expansion of CDC prevention research centers program to include centers on optimal maternity outcomes (a) In general Not later than one year after the date of the enactment of this Act, the Secretary of Health and Human Services shall support the establishment of additional Prevention Research Centers under the Prevention Research Center Program administered by the Centers for Disease Control and Prevention. Such additional centers shall each be known as a Center for Excellence on Optimal Maternity Outcomes. (b) Research Each Center for Excellence on Optimal Maternity Outcomes shall— (1) conduct at least one focused program of research to improve maternity outcomes, including the reduction of cesarean birth rates, elective inductions, prematurity rates, and low birth weight rates within an underserved population that has a disproportionately large burden of suboptimal maternity outcomes, including maternal mortality and morbidity, infant mortality, prematurity, or low birth weight, and developing performance and quality measures for accountability; (2) work with partners on special interest projects, as specified by the Centers for Disease Control and Prevention and other relevant agencies within the Department of Health and Human Services, and on projects funded by other sources; and (3) involve a minimum of two distinct birth setting models, such as a hospital labor and delivery model and freestanding birth center model