Two of Minneapolis-St. Paul, MN, areas biggest medical groups will collaborate in a seven-year effort to slow the rise of medical costs. HealthPartners and Allina Hospitals and Clinics announced that they plan to try out new payment formulas to reward quality and improve patient satisfaction, ultimately producing lower costs in the area. Allina is the Twin Cities' biggest clinic and hospital group. HealthPartners is the state's third-biggest health insurer and also has a chain of clinics.