AetnaAmerican Risk InsuranceAssurant HealthBlue Cross Blue Shield of TexasCIGNACNACNA SuretyChubb GroupDelta Dental Plans AssociationDentalSelectFrontier General InsuranceGlatfelter Healthcare PracticeHumana, Inc.Kemper CompaniesLincoln Financial GroupMetLife InsuranceMutual of OmahaPhiladelphia InsurancePrincipal Financial GroupPrudentialSafeco InsuranceSun Life FinancialThe Guardian Life Insurance Co.The HartfordTravelers InsuranceUnitedHealthcareUnum Group