The URLs for the PBM Web sites were obtained from a commercial directory of health care management companies published in 1999 by Atlantic Information Services, Inc.
The directory included 103 PBMs; URLs were available for 89.
Of those 89, 74 firms had sites that were working at the time of data collection (3 sites were identical with a parent company which was also represented and were therefore eliminated).
As a result, 71 (70% of all PBMs) were included in this study.

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