Participating sites
| Facility | Outpatient visits (in 1999) |
|---|---|
| Intervention | |
| Minneapolis, MN | 402492 |
| Black Hills, SD | 165941 |
| St Cloud, MN | 137371 |
| Sioux Falls, SD | 106147 |
| Fargo, ND | 94727 |
| Control | |
| Little Rock, AR | 438770 |
| Charleston, SC | 250485 |
| Des Moines, IA | 192616 |
| Madison, WI | 158031 |
| Wichita, KS | 129593 |
| Honolulu, HI | 116791 |