| Business | Phone |
| Clinical Research Assoc Llc 4334 Nw Expressway St, Oklahoma City 73116 | (405) 840-5971 |
| Cor Clinical Research 1211 N Shartel Ave # 802, Oklahoma City 73103 | (405) 272-8481 |
| Health Research Institute 1044 Sw 44th St # 403, Oklahoma City 73109 | (405) 616-4888 |
| Intouch Research 5300 N Grand Blvd, Oklahoma City 73112 | (405) 949-0799 |
| Ips Research Co 1111 N Lee Ave # 400, Oklahoma City 73103 | (405) 235-8188 |
| Lynn Institute 5300 N Independence Ave # 130, Oklahoma City 73112 | (405) 447-7729 |