| Clinical Research Advantage, Inc./Simon Williamson Clinic | Birmingham | Alabama | 35211 | - |
| Clinical Research Advantage, Inc./East Valley Family Physicians, PLC | Chandler | Arizona | 85224 | - |
| Clinical Research Advantage, Inc./Central Phoenix Medical Clinic, LLC | Phoenix | Arizona | 85020 | - |
| St. Joseph's Hospital & Medical Center - Barrow Neurologic Institute (BNI) | Phoenix | Arizona | 85013 | - |
| Mayo Clinic Arizona, May Clinic Scottsdale | Scottsdale | Arizona | 85259 | - |
| Radiant Research Inc. | Tucson | Arizona | 85712 | - |
| Anaheim Clinical Trials, LLC | Anaheim | California | 92801 | - |
| Axiom Research, LLC | Apple Valley | California | 92307 | - |
| Hope Clinical Research | Canoga Park | California | 91303 | - |
| Axiom Research, LLC | Colton | California | 92324 | - |
| Pharmacology Research Institute | Encino | California | 91316 | - |
| California Headache and Balance Center | Fresno | California | 93720 | - |
| Neuro-Pain Medical Center | Fresno | California | 93710 | - |
| Sun Valley Research Center | Imperial | California | 92251 | - |
| Grossmont Center For Clinical Research | La Mesa | California | 91942 | - |
| Pharmacology Research Institute | Los Alamitos | California | 90720 | - |
| California Advanced Neurotherapeutic, Inc. | Los Angeles | California | 90024 | - |
| Cedars Sinai Pain Center | Los Angeles | California | 90048 | - |
| Pharmacology Research Institute | Newport Beach | California | 92660 | - |
| Rancho Cucamonga Clinical Research | Rancho Cucamonga | California | 91730 | - |
| Desert Valley Research | Rancho Mirage | California | 92270 | - |
| George J Rederich MD, Inc | Redondo Beach | California | 90277 | - |
| Artemis Institute For Clinical Research | San Diego | California | 92103 | - |
| Clinical Research Advantage, Inc./Cassidy Medical Group-Vista | Vista | California | 92083 | - |
| Clinicos, LLC | Colorado Springs | Colorado | 80904 | - |
| Colorado Neurological Institute | Englewood | Colorado | 80113 | - |
| Advanced Neurosciences Research, LLC | Fort Collins | Colorado | 80528 | - |
| Georgetown University Hospital | Washington D.C. | District of Columbia | 20007 | - |
| Radiant Clinical Research | Washington D.C. | District of Columbia | 20016 | - |
| Aventura Neurological Associates | Aventura | Florida | 33180 | - |
| Clinical Research South Florida | Coral Gables | Florida | 33134 | - |
| Avail Clinical Research, LLC | DeLand | Florida | 32720 | - |
| Broward Research Group | Hollywood | Florida | 33024 | - |
| Health Awareness, Inc. | Jupiter | Florida | 33458 | - |
| Neurology Associates, P.A. | Maitland | Florida | 32751 | - |
| LCC Medical Research Institute, LLC | Miami | Florida | 33126 | - |
| Well Pharma Medical Research, Corp. | Miami | Florida | 33143 | - |
| Panax Clinical Research | Miami Lakes | Florida | 33014 | - |
| Suncoast Clinical Research | New Port Richey | Florida | 34652 | - |
| Renstar Medical Research | Ocala | Florida | 34470 | - |
| Sensible Healthcare, LLC | Ocoee | Florida | 34761 | - |
| QPS MRA, LLC (Miami Research Associates) | South Miami | Florida | 33143 | - |
| Palm Beach Research Center | West Palm Beach | Florida | 33409 | - |
| NeuroTrials Research, Inc. | Atlanta | Georgia | 30342 | - |
| The Kaufmann Clinic, Inc. | Atlanta | Georgia | 30308 | - |
| Advanced Clinical Research | Meridian | Idaho | 83642 | - |
| Cedar Crosse Research Center | Chicago | Illinois | 60607 | - |
| Clinical Research Advantage, Inc./Michigan Avenue Internists | Chicago | Illinois | 60604 | - |
| Robbins Headache Clinic | Riverwoods | Illinois | 60015 | - |
| Josephson Wallack Munshower Neurology P.C. | Indianapolis | Indiana | 46256 | - |
| L-MARC Research Center | Louisville | Kentucky | 40213 | - |
| Norton Neurology Services MS Services | Louisville | Kentucky | 40207 | - |
| Overlea Personal Physicians | Baltimore | Maryland | 21236 | - |
| Seton Medical Group | Baltimore | Maryland | 21228 | - |
| BTC of New Bedford | New Bedford | Massachusetts | 02740 | - |
| Beacon Clinical Research, LLC | Quincy | Massachusetts | 02169 | - |
| New England Regional Headache Center, Inc. | Worcester | Massachusetts | 01605 | - |
| Quest Research Institute | Farmington Hills | Michigan | 48334 | - |
| Minneapolis Clinic of Neurology | Golden Valley | Minnesota | 55422 | - |
| The Headache Center | Ridgeland | Mississippi | 39157 | - |
| Clinical Research Advantage, Inc./Prairie Fields Family Medicine, PC | Fremont | Nebraska | 68025 | - |
| Clinical Research Advantage, Inc | Omaha | Nebraska | 68114 | - |
| Meridian Clinical Research, LLC | Omaha | Nebraska | 68134 | - |
| Hope Research Institute | Las Vegas | Nevada | 89106 | - |
| Dartmouth-Hitchcock Medical Center | Lebanon | New Hampshire | 03756 | - |
| Princeton Medical Institute | Princeton | New Jersey | 08540 | - |
| Princeton Center for Clinical Research | Skillman | New Jersey | 08558 | - |
| Bio Behavioral Health | Toms River | New Jersey | 08755 | - |
| DENT Neurosciences Research Center | Amherst | New York | 14226 | - |
| Cushing Neuroscience Institute North Shore-LIJ Medical Group | Great Neck | New York | 11021 | - |
| ProHealth Care Associates, LLP | Plainview | New York | 11803 | - |
| Upstate Clinical Research Associates, LLC | Williamsville | New York | 14221 | - |
| Westchester Neuro. Const | Yonkers | New York | 10701 | - |
| Carolina Headache Institute | Durham | North Carolina | 27713 | - |
| Headache Wellness Center, PC | Greensboro | North Carolina | 27405 | - |
| Lake Shore Clinical Research, LLC | Mooresville | North Carolina | 28117 | - |
| Raleigh Neurology Associates, PA | Raleigh | North Carolina | 27607 | - |
| Plains Clinical Research Center, LLC | Fargo | North Dakota | 58104 | - |
| Radiant Research, Inc. | Akron | Ohio | 44311 | - |
| CTI Clinical Research Center | Cincinnati | Ohio | 45227 | - |
| Patient Priority Clinical Sites, LLC | Cincinnati | Ohio | 45215 | - |
| Sentral Clinical Research Services | Cincinnati | Ohio | 45212 | - |
| University of Cincinnati Dept of Psychiatry & Behavioral Neuroscience | Cincinnati | Ohio | 45219 | - |
| Rapid Medical Research, Inc. | Cleveland | Ohio | 44122 | - |
| The Cleveland Clinic Foundation | Cleveland | Ohio | 44195 | - |
| Sooner Clinical Research | Oklahoma City | Oklahoma | 73112 | - |
| Preferred Primary Care Physicians, Inc. | Pittsburgh | Pennsylvania | 15236 | - |
| Preferred Primary Care Physicians | Uniontown | Pennsylvania | 15401 | - |
| Abington Neurological Associates, Ltd. | Willow Grove | Pennsylvania | 19090 | - |
| Radiant Research, Inc. | Anderson | South Carolina | 29621 | - |
| Clinical Trials of South Carolina | Charleston | South Carolina | 29406 | - |
| Vista Clinical Research | Columbia | South Carolina | 29201 | - |
| Hillcrest Clinical Research, LLC | Simpsonville | South Carolina | 29681 | - |
| Middle Tennessee Clinical Research | Fayetteville | Tennessee | 37334 | - |
| Volunteer Research Group | Knoxville | Tennessee | 37920 | - |
| Baptist Memorial Medical Group (Neurology Specialist - Headache Clinic) | Memphis | Tennessee | 38120 | - |
| Radiant Research, Inc | Dallas | Texas | 75234 | - |
| Texas Neurology, P.A. | Dallas | Texas | 75214 | - |
| Research Trials Worldwide, LLC | Humble | Texas | 77338 | - |
| Advanced Research Institute | Ogden | Utah | 84403 | - |
| Charlottesville Medical Research Center, LLC | Charlottesville | Virginia | 22911 | - |
| iNeuro Headache Specialist | McLean | Virginia | 22102 | - |
| Clinical Research Associates of Tidewater | Norfolk | Virginia | 23507 | - |
| Blue Ridge Research Center, LLC | Roanoke | Virginia | 24018 | - |
| Sentara Neurology Specialists | Virginia Beach | Virginia | 23456 | - |
| Summit Research Network Seattle, LLC | Seattle | Washington | 98104 | - |
| South Puget Sound Neurology | Tacoma | Washington | 98409 | - |
| West Virginia University, Department of Neurology | Morgantown | West Virginia | 26506 | - |
| Medical College of Wisconsin, Department of Neurology | Milwaukee | Wisconsin | 53226 | - |