title: The relationships among dimensions of health services in two provider systems: a causal model approach.
mesh_terms: D000328:Adult; D054598:Blue Cross Blue Shield Insurance Plans; D003695:Delivery of Health Care; D005260:Female; D006279:Health Maintenance Organizations; D006801:Humans; D007350:Insurance, Hospitalization; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D014861:Washington