Cardiac care: hospitals compete in crowded markets.
D002300:Cardiac Care Facilities / Q000191:economics*; D006328:Cardiac Catheterization / Q000191:economics; D002309:Cardiology / Q000191:economics*; D004465:Economic Competition; D004467:Economics; D006752:Hospital Planning; D006782:Hospitals, Special / Q000191:economics*; D006801:Humans; D007182:Income; D014481:United States