Martin DP, Diehr P, Price KF, Richardson WC. Effect of a gatekeeper plan on health services use and charges: a randomized trial. Am J Public Health. 1989 Dec;79(12):1628-32.
Martin DP, Diehr P, Price KF, Richardson WC. Effect of a gatekeeper plan on health services use and charges: a randomized trial. Am J Public Health. 1989 Dec;79(12):1628-32.