title: Humana to buy chunk of Chicago HMO market.
authors: P J
authors: PJ
authors: Kenkel
mesh_terms: D002641:Chicago; D006273:Health Facility Merger; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D006777:Hospitals, Proprietary / Q000639:trends*; D009096:Multi-Institutional Systems / Q000639:trends