Diehr P, Silberg N, Martin DP, Arlow V, Leickly R. Use of a preferred provider plan by employees of the City of Seattle. Med Care. 1990 Nov;28(11):1073-88.
Diehr P, Silberg N, Martin DP, Arlow V, Leickly R. Use of a preferred provider plan by employees of the City of Seattle. Med Care. 1990 Nov;28(11):1073-88.