CHICAGO--(BUSINESS WIRE)--Fitch Ratings has published a new report detailing key credit metrics of nine publicly-traded U.S. health insurance and managed care companies that are either rated or followed by Fitch: Aetna Inc., Anthem, Inc., Centene Corp., Cigna Corp., Health Net Inc., Humana, Inc., Molina Health Care Inc. UnitedHealth Group, Inc. and WellCare Health Plans, Inc. The report includes Fitch's projection of key credit metrics as affected by acquisitions and is a desktop guide that pro