| Company | GREAT LAKES PHYSICIANS, P.C. |
| Business Number | 4779919 |
| Company | BUFFALO ENDOVASCULAR AND VASCULAR SURGICAL ASSOCIATES PLLC |
| Business Number | 3557327 |
| Company | BUFFALO DMD REALTY, INC. |
| Business Number | 3389044 |
| Company | WESTLINK IPA, L.L.C. |
| Business Number | 2191996 |
| Company | HEALTHLINK L.L.C. |
| Business Number | 2066014 |