A Study to Evaluate a Modified RNA Vaccine Against Influenza in Adults 18 Years of Age or Older
Public ClinicalTrials.gov record NCT05540522. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A PHASE 3, RANDOMIZED, OBSERVER-BLINDED STUDY TO EVALUATE THE EFFICACY, SAFETY, TOLERABILITY, AND IMMUNOGENICITY OF A MODIFIED RNA VACCINE AGAINST INFLUENZA COMPARED TO LICENSED INACTIVATED INFLUENZA VACCINE IN HEALTHY ADULTS 18 YEARS OF AGE OR OLDER
Study identification
- NCT ID
- NCT05540522
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 3
- Lead sponsor
- Pfizer
- Industry
- Enrollment
- 45,789 participants
Conditions and interventions
Conditions
Interventions
- Quadrivalent influenza modRNA vaccine Biological
- Quadrivalent influenza vaccine Biological
Biological
Eligibility (public fields only)
- Age range
- 18 Years and older
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Sep 11, 2022
- Primary completion
- Mar 11, 2024
- Completion
- Mar 11, 2024
- Last update posted
- May 7, 2025
2022 – 2024
United States locations
- U.S. sites
- 263
- U.S. states
- 42
- U.S. cities
- 195
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| North Alabama Research Center | Athens | Alabama | 35611 | — |
| St. Vincent's Birmingham Hospital | Birmingham | Alabama | 35205 | — |
| Accel Research Sites Network - Birmingham Clinical Research Unit | Birmingham | Alabama | 35216 | — |
| Ross Bridge Medical Practice, LLC-CCT Research | Birmingham | Alabama | 35226 | — |
| SEC Clinical Research | Dothan | Alabama | 36305 | — |
| Lakeview Clinical Research | Guntersville | Alabama | 35976 | — |
| Medical Affiliated Research Center | Huntsville | Alabama | 35801 | — |
| Lenzmeier Family Medicine/CCT Research | Glendale | Arizona | 85308 | — |
| Aventiv Research | Mesa | Arizona | 85206 | — |
| Desert Clinical Research/ CCT Research | Mesa | Arizona | 85213 | — |
| HOPE Research Institute | Phoenix | Arizona | 85018 | — |
| The Pain Center of Arizona | Phoenix | Arizona | 85018 | — |
| HOPE Research Institute - Phoenix | Phoenix | Arizona | 85023 | — |
| HOPE Research Institute | Phoenix | Arizona | 85023 | — |
| Foothills Research Center/ CCT Research | Phoenix | Arizona | 85044 | — |
| Epic Medical Research - Surprise | Surprise | Arizona | 85378 | — |
| Fiel Family and Sports Medicine, PC/CCT Research | Tempe | Arizona | 85283 | — |
| HOPE Research Institute | Tempe | Arizona | 85284 | — |
| Noble Clinical Research | Tucson | Arizona | 85704 | — |
| Baptist Health Center For Clinical Research | Little Rock | Arkansas | 72205 | — |
| Applied Research Center of Arkansas | Little Rock | Arkansas | 72212 | — |
| Anaheim Clinical Trials | Anaheim | California | 92801 | — |
| Velocity Clinical Research, San Bernardino | Banning | California | 92220 | — |
| Benchmark Research | Colton | California | 92324 | — |
| Ascada Health PC dba Ascada Research | Fullerton | California | 92835 | — |
| Marvel Clinical Research | Huntington Beach | California | 92647 | — |
| Velocity Clinical Research, Huntington Park | Huntington Park | California | 90255 | — |
| Velocity Clinical Research, San Diego | La Mesa | California | 91942 | — |
| Orange County Research Center | Lake Forest | California | 92630 | — |
| Ark Clinical Research | Long Beach | California | 90815 | — |
| Kaiser Permanente | Los Angeles | California | 90027 | — |
| Velocity Clinical Research, Westlake | Los Angeles | California | 90057 | — |
| Velocity Clinical Research, North Hollywood | North Hollywood | California | 91606 | — |
| Center for Clinical Trials, LLC | Paramount | California | 90723 | — |
| Empire Clinical Research | Pomona | California | 91767 | — |
| Paradigm Clinical Research Centers, Inc | Redding | California | 96001 | — |
| Peninsula Research Associates | Rolling Hills Estates | California | 90274 | — |
| Benchmark Research | Sacramento | California | 95864 | — |
| Artemis Institute for Clinical Research | San Diego | California | 92103 | — |
| Wr-McCr, Llc | San Diego | California | 92120 | — |
| California Research Foundation | San Diego | California | 92123 | — |
| Encompass Clinical Research | Spring Valley | California | 91978 | — |
| Med Partners, Inc. dba Premiere Medical Center of Burbank, Inc. | Toluca Lake | California | 91602 | — |
| Collaborative Neuroscience Research, LLC | Torrance | California | 90504 | — |
| Ark Clinical Research - Tustin | Tustin | California | 92780 | — |
| Diablo Clinical Research, Inc. | Walnut Creek | California | 94598 | — |
| Lynn Institute of Denver | Aurora | Colorado | 80012 | — |
| Tekton Research, LLC. | Fort Collins | Colorado | 80525 | — |
| Tekton Research, LLC. | Longmont | Colorado | 80501 | — |
| Paradigm Clinical Research Centers, Inc | Wheat Ridge | Colorado | 80033 | — |
| New England Research Associates, LLC | Bridgeport | Connecticut | 06606 | — |
| Clinical Research Consulting | Milford | Connecticut | 06460 | — |
| New Haven Clinical Research Unit | New Haven | Connecticut | 06511 | — |
| Yale Cardiology | New Haven | Connecticut | 06519 | — |
| Yale University School of Medicine | New Haven | Connecticut | 06519 | — |
| Stamford Therapeutics Consortium | Stamford | Connecticut | 06905 | — |
| Washington Health Institute | Washington D.C. | District of Columbia | 20017 | — |
| JEM Research Institute | Atlantis | Florida | 33462 | — |
| Tampa Bay Medical Research | Clearwater | Florida | 33761 | — |
| Alliance for Multispecialty Research, LLC | Coral Gables | Florida | 33134 | — |
| Universal Axon Clinical Research, LLC | Doral | Florida | 33166 | — |
| Fleming Island Center for Clinical Research | Fleming Island | Florida | 32003 | — |
| Proactive Clinical Research,LLC | Fort Lauderdale | Florida | 33308 | — |
| Alliance for Multispecialty Research, LLC | Fort Myers | Florida | 33912 | — |
| Robert B. Pritt, DO | Fort Myers | Florida | 33912 | — |
| Best Quality Research,Inc. | Hialeah | Florida | 33016 | — |
| Jacksonville Center for Clinical Research | Jacksonville | Florida | 32216 | — |
| Clinical Neuroscience Solutions, Inc. dba CNS Healthcare | Jacksonville | Florida | 32256 | — |
| Health Awareness | Jupiter | Florida | 33458 | — |
| Wr-Msra.Llc | Lake City | Florida | 32055 | — |
| JEM Research Institute | Lake Worth | Florida | 33462 | — |
| Accel Research Sites Network - Lakeland Clinical Research Unit | Lakeland | Florida | 33803 | — |
| Accel Research Sites - St. Petersburg Clinical Research Unit | Largo | Florida | 33777 | — |
| Accel Research Sites Network - Maitland Clinical Research Unit | Maitland | Florida | 32751 | — |
| Care Research - West Flagler Street | Miami | Florida | 33130 | — |
| Gerardo Polanco, MD | Miami | Florida | 33156 | — |
| Entrust Clinical Research | Miami | Florida | 33176 | — |
| Miami Dade Medical Research Institute, LLC | Miami | Florida | 33176 | — |
| Palm Springs Community Health Center | Miami Lakes | Florida | 33014 | — |
| Clinical Neuroscience Solutions, Inc. | Orlando | Florida | 32801 | — |
| Headlands Research Orlando | Orlando | Florida | 32819 | — |
| Innovation Medical Research Center | Palmetto Bay | Florida | 33157 | — |
| DBC Research USA | Pembroke Pines | Florida | 33029 | — |
| United Medical Research | Port Orange | Florida | 32127 | — |
| Genesis Clinical Research, LLC | Tampa | Florida | 33603 | — |
| Angels Clinical Research Institute | Tampa | Florida | 33614 | — |
| Clinical Site Partners, LLC dba Flourish Research | Winter Park | Florida | 32789 | — |
| Centricity Research Columbus Georgia Multispecialty | Columbus | Georgia | 31904 | — |
| IACT Health | Rincon | Georgia | 31326 | — |
| Centricity Research Rincon Pulmonology | Rincon | Georgia | 31406 | — |
| AGILE Clinical Research Trials, LLC | Sandy Springs | Georgia | 30328 | — |
| WR-Mount Vernon Clinical Research, LLC | Sandy Springs | Georgia | 30328 | — |
| CenExel iResearch, LLC | Savannah | Georgia | 31405 | — |
| Javara - Privia Medical Group Georgia - Savannah | Savannah | Georgia | 31406 | — |
| Velocity Clinical Research, Savannah | Savannah | Georgia | 31406 | — |
| Clinical Research Atlanta | Stockbridge | Georgia | 30281 | — |
| Rophe Adult and Pediatric Medicine/SKYCRNG | Union City | Georgia | 30291 | — |
| East-West Medical Research Institute | Honolulu | Hawaii | 96814 | — |
| Clinical Research Prime | Idaho Falls | Idaho | 83404 | — |
| Solaris Clinical Research | Meridian | Idaho | 83646 | — |
| Koch Family Medicine | Morton | Illinois | 61550 | — |
| Accellacare - DuPage | Oak Lawn | Illinois | 60453 | — |
| MediSphere Medical Research Center - Evansville - West Franklin Street | Evansville | Indiana | 47712 | — |
| MediSphere Medical Research Center - EAST | Evansville | Indiana | 47714 | — |
| Velocity Clinical Research, Valparaiso | Valparaiso | Indiana | 46383 | — |
| University of Iowa | Iowa City | Iowa | 52242 | — |
| Velocity Clinical Research, Sioux City | Sioux City | Iowa | 51106 | — |
| Alliance for Multispecialty Research, LLC | Newton | Kansas | 67114 | — |
| Alliance for Multispecialty Research, LLC | Wichita | Kansas | 67205 | — |
| Alliance for Multispecialty Research, LLC | Wichita | Kansas | 67207 | — |
| Alliance for Multispecialty Research, LLC | Lexington | Kentucky | 40509 | — |
| Versailles Family Medicine / CCT Research | Versailles | Kentucky | 40383 | — |
| MedPharmics, LLC | Lafayette | Louisiana | 70508 | — |
| DelRicht Research | New Orleans | Louisiana | 70115 | — |
| Alliance for Multispecialty Research, LLC | New Orleans | Louisiana | 70119 | — |
| Louisiana State University Health Sciences Shreveport | Shreveport | Louisiana | 71101 | — |
| Pharmaron | Baltimore | Maryland | 21201 | — |
| Advanced Primary and Geriatric Care - CCT Research | Rockville | Maryland | 20850 | — |
| Jadestone Clinical Research | Silver Spring | Maryland | 20904 | — |
| Brigham and Women's Hospital | Boston | Massachusetts | 02115 | — |
| Boston Medical Center | Boston | Massachusetts | 02118 | — |
| ActivMed Practices and Research | Methuen | Massachusetts | 01844 | — |
| University of Massachusetts Chan Medical School | Worcester | Massachusetts | 01655 | — |
| Henry Ford Hospital | Detroit | Michigan | 48202 | — |
| Ascension St. John Hospital | Grosse Pointe Woods | Michigan | 48236 | — |
| Revival Research Institute, LLC | Sterling Heights | Michigan | 48312 | — |
| Oakland Medical Research | Troy | Michigan | 48085 | — |
| Arcturus Healthcare , PLC, Troy Internal Medicine Research Division | Troy | Michigan | 48098 | — |
| Clinical Research Professionals | Chesterfield | Missouri | 63005 | — |
| Bio-Kinetic Clinical Applications, LLD dba QPS-MO | Springfield | Missouri | 65802 | — |
| QPS Bio-Kinetic Clinical Applications (Patient Screening Only) | Springfield | Missouri | 65807 | — |
| Saint Louis University Center for Vaccine Development | St Louis | Missouri | 63104 | — |
| Sundance Clinical Research | St Louis | Missouri | 63141 | — |
| Bozeman Health Deaconess Hospital | Bozeman | Montana | 59715 | — |
| Methodist Physicians Clinic/CCT Research | Fremont | Nebraska | 68025 | — |
| Velocity Clinical Research, Grand Island | Grand Island | Nebraska | 68803 | — |
| Be Well Clinical Studies | Lincoln | Nebraska | 68516 | — |
| Velocity Clinical Research, Norfolk | Norfolk | Nebraska | 68701 | — |
| Quality Clinical Research | Omaha | Nebraska | 68114 | — |
| Velocity Clinical Research, Omaha | Omaha | Nebraska | 68134 | — |
| Papillion Research Center/CCT Research | Papillion | Nebraska | 68046 | — |
| Excel Clinical Research, LLC | Las Vegas | Nevada | 89109 | — |
| Santa Rosa Medical Centers of Nevada / CCT Research | Las Vegas | Nevada | 89119 | — |
| ActivMed Practices & Research, LLC. | Portsmouth | New Hampshire | 03801 | — |
| David Jurist Research Building | Hackensack | New Jersey | 07601 | — |
| Hackensack University Medical Center Medical Plaza | Hackensack | New Jersey | 07601 | — |
| Hackensack University Medical Center | Hackensack | New Jersey | 07601 | — |
| South Jersey Infectious Disease | Somers Point | New Jersey | 08244 | — |
| Albuquerque Clinical Trials, Inc. | Albuquerque | New Mexico | 87102 | — |
| Velocity Clinical Research, Albuquerque | Albuquerque | New Mexico | 87107 | — |
| Smith Allergy & Asthma Specialists | Horseheads | New York | 14845 | — |
| NYU Langone Health | New York | New York | 10016 | — |
| Rochester Clinical Research, LLC | Rochester | New York | 14609 | — |
| Velocity Clinical Research, Vestal | Vestal | New York | 13850 | — |
| Accellacare - Cary | Cary | North Carolina | 27518 | — |
| Accellacare - Charlotte | Charlotte | North Carolina | 28211 | — |
| Carolina Institute for Clinical Research | Fayetteville | North Carolina | 28303 | — |
| PharmQuest Life Sciences, LLC | Greensboro | North Carolina | 27408 | — |
| Accellacare - Hickory | Hickory | North Carolina | 28601 | — |
| Monroe Biomedical Research | Monroe | North Carolina | 28112 | — |
| Accellacare - Raleigh | Raleigh | North Carolina | 27609 | — |
| M3 Wake Research, Inc. | Raleigh | North Carolina | 27612 | — |
| Accellacare - Rocky Mount | Rocky Mount | North Carolina | 27804 | — |
| Accellacare - Salisbury | Salisbury | North Carolina | 28144 | — |
| Accellacare - Wilmington | Wilmington | North Carolina | 28401 | — |
| Trial Management Associates - Wilmington - Floral Parkway | Wilmington | North Carolina | 28403 | — |
| Accellacare - Winston-Salem | Winston-Salem | North Carolina | 27103 | — |
| Plains Clinical Research Center | Fargo | North Dakota | 58104 | — |
| Plains Medical Clinic, LLC | Fargo | North Dakota | 58104 | — |
| CTI Clinical Research Center | Cincinnati | Ohio | 45212 | — |
| Meridian Clinical Research, LLC | Cincinnati | Ohio | 45219 | — |
| Cincinnati Children's Hospital Medical Center | Cincinnati | Ohio | 45229 | — |
| University Hospitals Cleveland Medical Center | Cleveland | Ohio | 44106 | — |
| Senders Pediatrics | Cleveland | Ohio | 44121 | — |
| Velocity Clinical Research, Cleveland | Cleveland | Ohio | 44122 | — |
| Centricity Research Columbus Ohio Multispecialty | Columbus | Ohio | 43213 | — |
| Dayton Clinical Research | Dayton | Ohio | 45409 | — |
| WellNow Urgent Care & Research | Dayton | Ohio | 45424 | — |
| PriMED Clinical Research | Dayton | Ohio | 45429 | — |
| Tekton Research, LLC. | Edmond | Oklahoma | 73013 | — |
| Tekton Research, LLC. | Moore | Oklahoma | 73160 | — |
| Lynn Institute of Norman | Norman | Oklahoma | 73072 | — |
| Lynn Health Science Institute | Oklahoma City | Oklahoma | 73112 | — |
| Tekton Research, LLC. | Yukon | Oklahoma | 73099 | — |
| Velocity Clinical Research, Medford | Medford | Oregon | 97504 | — |
| Kaiser Permanente Northwest Center for Health Research | Portland | Oregon | 97227 | — |
| Lehigh Valley Health Network | Allentown | Pennsylvania | 18102 | — |
| Capital Area Research, LLC | Camp Hill | Pennsylvania | 17011 | — |
| Central Erie Primary Care | Erie | Pennsylvania | 16508 | — |
| Velocity Clinical Research, Providence | East Greenwich | Rhode Island | 02818 | — |
| Velocity Clinical Research, Anderson | Anderson | South Carolina | 29621 | — |
| Pharmacorp Clinical Trials | Charleston | South Carolina | 29412 | — |
| Velocity Clinical Research, Columbia | Columbia | South Carolina | 29204 | — |
| Velocity Clinical Research, Gaffney | Gaffney | South Carolina | 29340 | — |
| Tribe Clinical Research, LLC | Greenville | South Carolina | 29607 | — |
| Main Street Physician's Care | Little River | South Carolina | 29566 | — |
| Clinical Trials of South Carolina | Moncks Corner | South Carolina | 29461 | — |
| Trial Management Associates | Myrtle Beach | South Carolina | 29572 | — |
| Coastal Carolina Research Center | North Charleston | South Carolina | 29405 | — |
| Velocity Clinical Research, Spartanburg | Spartanburg | South Carolina | 29303 | — |
| Velocity Clinical Research, Union | Union | South Carolina | 29379 | — |
| Internal Medicine and Pediatric Associates of Bristol | Bristol | Tennessee | 37620 | — |
| WR-Clinsearch, LLC | Chattanooga | Tennessee | 37421 | — |
| Holston Medical Group | Kingsport | Tennessee | 37660 | — |
| Alliance for Multispecialty Research, LLC | Knoxville | Tennessee | 37909 | — |
| New Phase Research and Development | Knoxville | Tennessee | 37909 | — |
| Accellacare US Inc., d/b/a Accellacare of Knoxville | Knoxville | Tennessee | 37912 | — |
| Accellacare US Inc., d/b/a Accellacare of Knoxville | Knoxville | Tennessee | 37938 | — |
| Clinical Neuroscience Solutions Inc. | Memphis | Tennessee | 38119 | — |
| Elligo Clinical Research Center | Austin | Texas | 78704 | — |
| Benchmark Research | Austin | Texas | 78705 | — |
| Tekton Research, LLC. | Austin | Texas | 78745 | — |
| Orion Clinical Research | Austin | Texas | 78759 | — |
| Velocity Clinical Research, Austin | Austin | Texas | 78759 | — |
| Headlands Research - Brownsville | Brownsville | Texas | 78526 | — |
| WR-Global Medical Research, LLC | Dallas | Texas | 75224 | — |
| DFW Clinical Research | Dallas | Texas | 75234 | — |
| North Texas Infectious Diseases Consultants, P.A | Dallas | Texas | 75246 | — |
| Epic Medical Research - DeSoto | DeSoto | Texas | 75115 | — |
| Proactive Clinical Research, LLC | Edinburg | Texas | 78539 | — |
| Benchmark Research | Fort Worth | Texas | 76135 | — |
| Texas Health Family Care | Fort Worth | Texas | 76135 | — |
| Allure Health | Friendswood | Texas | 77546 | — |
| Trio Clinical Trials | Houston | Texas | 77008 | — |
| Juno Research | Houston | Texas | 77040 | — |
| Prolato Clinical Research Center | Houston | Texas | 77054 | — |
| DM Clinical Research - Bellaire | Houston | Texas | 77081 | — |
| Santa Clara Family Clinic | Houston | Texas | 77087 | — |
| Dynamed Clinical Research, LP d/b/a DM Clinical Research | Humble | Texas | 77338 | — |
| Andres Garcia Zuniga, M.D., P.A. | Laredo | Texas | 78041 | — |
| SMS Clinical Research | Mesquite | Texas | 75149 | — |
| AIM Trials, LLC | Plano | Texas | 75093 | — |
| Clinical Trials of Texas, LLC | San Antonio | Texas | 78229 | — |
| IMA Clinical Research San Antonio | San Antonio | Texas | 78229 | — |
| Tekton Research, LLC. | San Antonio | Texas | 78229 | — |
| Javara - Privia Medical Group North Texas - Stephenville | Stephenville | Texas | 76401 | — |
| Sugar Lakes Family Practice, PA | Sugar Land | Texas | 77479 | — |
| DM Clinical Research, Martin Diagnostic Clinic | Tomball | Texas | 77375 | — |
| Northwest Houston Heart Center | Tomball | Texas | 77375 | — |
| Crossroads Clinical Research | Victoria | Texas | 77901 | — |
| Cope Family Medicine / CCT Research | Bountiful | Utah | 84010 | — |
| South Ogden Family Medicine/ CCT Research | Ogden | Utah | 84405 | — |
| J. Lewis Research, Inc. / Foothill Family Clinic | Salt Lake City | Utah | 84109 | — |
| Olympus Family Medicine/CCT Research | Salt Lake City | Utah | 84117 | — |
| J. Lewis Research, Inc. / Foothill Family Clinic South | Salt Lake City | Utah | 84121 | — |
| J. Lewis Research, Inc. / Jordan River Family Medicine | South Jordan | Utah | 84095 | — |
| Springville Dermatology - Springville/CCT Research | Springville | Utah | 84663 | — |
| Velocity Clinical Research, Salt Lake City | West Jordan | Utah | 84088 | — |
| Clinical Alliance for Research and Education - Infectious Diseases (CARE-ID), LLC | Annandale | Virginia | 22003 | — |
| Charlottesville Medical Research | Charlottesville | Virginia | 22911 | — |
| Virginia Research Center | Midlothian | Virginia | 23114 | — |
| Health Research of Hampton Roads, Inc. | Newport News | Virginia | 23606 | — |
| Alliance for Multispecialty Research, LLC | Norfolk | Virginia | 23502 | — |
| Meridian Clinical Research LLC | Portsmouth | Virginia | 23703 | — |
| Clinical Research Partners, LLC | Richmond | Virginia | 23226 | — |
| Centricity Research Suffolk Primary Care | Suffolk | Virginia | 23435 | — |
| EvergreenHealth Medical Center | Kirkland | Washington | 98034 | — |
| EvergreenHealth | Kirkland | Washington | 98034 | — |
| Rainier Clinical Research Center | Renton | Washington | 98057 | — |
| Kaiser Permanente Washington Health Research Institute (KPWHRI) | Seattle | Washington | 98101 | — |
| Kaiser Permanente Washington Health Research Institute | Seattle | Washington | 98101 | — |
| Seattle Clinical Research Center | Seattle | Washington | 98105 | — |
| Allegiance Research Specialists, LLC | Wauwatosa | Wisconsin | 53226 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
Non-U.S. locations
This page focuses on the U.S. directory. The official record also lists 58 non-U.S. sites.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT05540522, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted May 7, 2025 · Synced Apr 27, 2026
Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.
Open the official record
The complete protocol, eligibility criteria, and contact information for NCT05540522 live on ClinicalTrials.gov.