After two years of planning, Ascension Health Alliance announced that Oklahoma-based Marian Health System and its three regional health systems joined Ascension Health, effective Monday. Financial terms of the deal were not disclosed. The organizations announced last fall that St. Louis-based Ascension Health Alliance had signed a memo of understanding to acquire Marian Health System. Marian Health System is comprised of three regional systems: Ministry Health Care in Wisconsin and Minnesota, St. John Health System in Oklahoma, and Via Christi Health in Kansas (an Ascension affiliate since 2007).