Question: Which hospital, the Psychiatric Institute of Washington or Howard University Hospital, is known for serving the African American community including former slaves?

<P0-S0> University Hospital Limerick (formerly known as Limerick Regional Hospital or Mid-Western Regional Hospital, Limerick) is a hospital located in Dooradoyle, Limerick, Ireland. <P0-S1>  It is managed by the Irish Government's Health Service Executive and provides acute-care hospital services, including a 24-hour emergency department, for the population of Ireland's Mid West Region, encompassing; counties Limerick, Clare, North Tipperary, and South Tipperary. <P0-S2>  In 2008, the hospital served 120,316 out-patients, and 23,014 in-patients, with an average stay of 5.8 nights. <P0-S3>  72.8% of admissions were made via the accident and emergency department or 16,720 patients. <P0-S4>  In total, 56,528 patients presented to the emergency department in 2008. <P0-S5>  The hospital saw 20,143-day cases in the same year. <P0-S6>  In July 2011, it was reported that the hospital would undergo its third name change in five years to become University Hospital Limerick following the establishment of the Graduate Medical School at the University of Limerick which is affiliated to the hospital. <SEP> <P1-S0> The Psychiatric Institute of Washington (PIW) is an acute (104 bed) psychiatric hospital in Washington, D.C. Opened in 1967, PIW is a short-term, private hospital. <P1-S1>  It offers behavioral healthcare to patients suffering from mental and addictive illnesses, including children, adolescents, adults and the elderly. <P1-S2>  Services offered by PIW include inpatient, partial and intensive outpatient hospitalization, and group treatment programs for substance abuse and addiction. <SEP> <P2-S0> Flat Rock is a historic African American community in DeKalb County, Georgia. <P2-S1>  It is located within the city of Lithonia, as well as the Arabia Mountain National Heritage Area. <P2-S2>  Flat Rock is believed to be the oldest African American settlement in DeKalb County and one of the oldest in Georgia. <P2-S3>  It began as an agricultural community bounded by the large South, Lyon, and Johnson farms. <P2-S4>  After emancipation, many former slaves stayed in the area, building schools, churches, and civic organizations. <P2-S5>  The community remained intact through The Great Migration and is the site of Flat Rock Archives and a historic cemetery. <SEP> <P3-S0> Howard University Hospital, previously known as Freedmen's Hospital, is a major hospital lcated in Washington, D.C., built on the site of the previous Griffith Stadium. <P3-S1>  The hospital has served the African American community in the area for over 150 years, having been established in 1862 to cater for the medical needs of the thousands of African Americans who came to Washington during the Civil War, seeking their freedom. <P3-S2>  The first hospital of its kind to provide medical treatment for former slaves, it later became the major hospital for the area's African-American community. <P3-S3>  Following the closure of D.C. General Hospital, As of 2016, the hospital has the highest rate of wrongful death lawsuits of any health facility in Washington D.C. over the previous decade.