ambulatorycare ambulatorymedicalcare economics ee4758 employee fees feesandcharges health healthbenefitplans insurance medical mentalhealth mentalhealthservices money physician-patientrelations preferredproviderorganizations preferredproviderorganizations(medicalcare) professional-patientrelations psychiatric psychoanalysts psychologicalaspects psychotherapistandpatient psychotherapists psychotherapy unitedstates utilization w275aa1w38e1991 wm30e271989