PPOs grew by 11% in 1993, with slight increase in pharmacy programs.
D005569:Formularies as Topic; D006801:Humans; D007343:Insurance Carriers / Q000706:statistics & numerical data; D010593:Pharmaceutical Services / Q000706:statistics & numerical data*; D011243:Preferred Provider Organizations / Q000706:statistics & numerical data*; D013997:Time Factors; D014481:United States