NIH 1987 R03 HS |
Impact of Copayments on Preventive Care in an Hmo Cherkin, Daniel C. / Group Health Cooperative of Puget Sound |
|
NIH 1986 R03 HS |
Impact of Copayments on Preventive Care in an Hmo Cherkin, Daniel C. / Group Health Cooperative of Puget Sound |
|