The Brief A legal dispute is causing delays in a proposed overhaul of a George Washington University medical practice group. D.C.'s Attorney General said his office has the authority to approve or reject the acquisition. What we know:The MFA, the largest medical practice group in Washington, D.C., treats more than 4,600 patients daily. Under the proposed transaction, which has been in development for months, Universal Health Services (UHS) would take over Medical Faculty Associates. The Office of the Attorney General declined to comment pending its official review.