InterStudy researchers trace progress of PPOs, provide insight into future growth.
D003256:Community Participation / Q000191:economics*; D003695:Delivery of Health Care / Q000639:trends*; D005069:Evaluation Studies as Topic; D005245:Fee Schedules; D006264:Health Benefit Plans, Employee / Q000639:trends*; D006761:Hospitals; D007348:Insurance, Health / Q000639:trends*; D010820:Physicians