DALLAS -- After almost two years of oversight, federal officials say a Dallas hospital system is in substantial compliance with Medicare program requirements. The U.S. Centers for Medicare & Medicaid Services said Wednesday that Parkland Health & Hospital System meets requirements of a "systems improvement agreement" that took effect Sept. 27, 2011. The agreement required the hospital to retain independent experts to analyze the hospital's operations and develop a plan to comply with Medicare quality-of-care requirements. David R. Wright, CMS deputy regional administrator, said in a news release that the completion of the agreement "places Parkland in the best position to have a sustainable culture of patient safety,"