{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Patient+letters&page=3",
    "query": {
      "intervention": "Patient letters",
      "page": 3
    },
    "page_size": 10
  },
  "pagination": {
    "page": 3,
    "page_size": 10,
    "total_count": 54,
    "total_pages": 6,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Patient+letters&page=4&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Patient+letters&page=2&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-11-15T00:05:12.224Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT01300949",
      "title": "Spaeth/Richman Contrast Sensitivity Test",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Glaucoma"
      ],
      "interventions": [
        {
          "name": "Spaeth/Richman Contrast Sensitivity Test",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Pelli-Robson Contrast Sensitivity Chart",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Wills Eye",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 314,
      "start_date": "2010-01",
      "completion_date": "2014-04",
      "has_results": true,
      "last_update_posted_date": "2018-12-11",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01300949"
    },
    {
      "nct_id": "NCT05096026",
      "title": "Effect of Electronic and Mail Outreach From Primary Care Physicians for COVID-19 Vaccination Among Elderly Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vaccination"
      ],
      "interventions": [
        {
          "name": "Standard PCP Outreach",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Culturally Tailored PCP Outreach",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Kaiser Permanente",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 8287,
      "start_date": "2021-03-29",
      "completion_date": "2021-08-31",
      "has_results": false,
      "last_update_posted_date": "2021-10-27",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Oakland, California",
      "locations": [
        {
          "city": "Oakland",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05096026"
    },
    {
      "nct_id": "NCT04758637",
      "title": "AESOPS Trial 2 (AESOPS-2): Availability of Opioid Harm",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Opioid Abuse"
      ],
      "interventions": [
        {
          "name": "Overdose Notification",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 61,
      "start_date": "2023-01-23",
      "completion_date": "2024-03-18",
      "has_results": true,
      "last_update_posted_date": "2025-10-07",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04758637"
    },
    {
      "nct_id": "NCT06456294",
      "title": "Evaluation of a Medication Health Center to Promote Opioid Safety",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Overdose"
      ],
      "interventions": [
        {
          "name": "MHC Outreach Intervention",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Kaiser Permanente",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 14,
      "start_date": "2022-06-15",
      "completion_date": "2025-01-01",
      "has_results": false,
      "last_update_posted_date": "2024-06-14",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06456294"
    },
    {
      "nct_id": "NCT05172687",
      "title": "The Effect of De-Prescribing Antipsychotics on Health and Quality of Life for People With Dementia",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Alzheimer Disease",
        "Dementia",
        "Prescribing, Off-Label"
      ],
      "interventions": [
        {
          "name": "Overprescribing letter to attributed physician",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Placebo letter to attributed physician",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 336460,
      "start_date": "2015-04",
      "completion_date": "2018-12-31",
      "has_results": false,
      "last_update_posted_date": "2024-02-13",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 3,
      "location_summary": "Boston, Massachusetts • Cambridge, Massachusetts • New York, New York",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Cambridge",
          "state": "Massachusetts"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05172687"
    },
    {
      "nct_id": "NCT06128239",
      "title": "Comparing Suicide Prevention Interventions to Guide Follow-up Care: The SPRING Trial",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Suicide",
        "Suicide Prevention",
        "Suicide and Self-harm"
      ],
      "interventions": [
        {
          "name": "Caring Contacts",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "St. Luke's Health System, Boise, Idaho",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 854,
      "start_date": "2023-12-29",
      "completion_date": "2026-03-31",
      "has_results": false,
      "last_update_posted_date": "2025-07-09",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Boise, Idaho",
      "locations": [
        {
          "city": "Boise",
          "state": "Idaho"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06128239"
    },
    {
      "nct_id": "NCT02876926",
      "title": "Evaluating a Real-Time, Remote Monitoring System for Home-Based HIV Testing",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "HIV"
      ],
      "interventions": [
        {
          "name": "\"Smart\" home-based test for HIV",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Home-based testing only",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Reminder letters for clinic-based testing",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brown University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 65,
      "start_date": "2016-07",
      "completion_date": "2018-02-15",
      "has_results": true,
      "last_update_posted_date": "2019-04-19",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Providence, Rhode Island",
      "locations": [
        {
          "city": "Providence",
          "state": "Rhode Island"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02876926"
    },
    {
      "nct_id": "NCT05730582",
      "title": "Increasing Uptake of EHR-enabled Population Health Outreach Strategies to Improve Diabetes Screening",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Diabetes Mellitus, Type 2",
        "Pre Diabetes"
      ],
      "interventions": [
        {
          "name": "Parkland Diabetes Detection Program (PDDP) Screening Invitation",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 500000,
      "start_date": "2024-03-05",
      "completion_date": "2028-12-30",
      "has_results": false,
      "last_update_posted_date": "2026-09-02",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05730582"
    },
    {
      "nct_id": "NCT01039324",
      "title": "Care Transitions for Complex Patient - Cycle 1 and Cycle 2",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Asthma",
        "Coronary Artery Disease",
        "Diabetes",
        "Hypertension",
        "Congestive Heart Failure"
      ],
      "interventions": [
        {
          "name": "Reports",
          "type": "OTHER"
        },
        {
          "name": "Reports and Notices",
          "type": "OTHER"
        },
        {
          "name": "Usual care",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 8422,
      "start_date": "2009-12",
      "completion_date": "2012-09",
      "has_results": false,
      "last_update_posted_date": "2014-05-15",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01039324"
    },
    {
      "nct_id": "NCT05528939",
      "title": "Feasibility/Acceptability of Attentional-Control Training in Survivors",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Pediatric Cancer",
        "Pediatric ALL",
        "Pediatric Brain Tumor",
        "Attention Difficulties",
        "Cognitive Deficit in Attention"
      ],
      "interventions": [
        {
          "name": "EndeavorRx",
          "type": "DEVICE"
        },
        {
          "name": "Control video game",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "OTHER"
      ],
      "sponsor": "Children's National Research Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": "16 Years",
        "sex": "ALL",
        "summary": "8 Years to 16 Years"
      },
      "enrollment_count": 50,
      "start_date": "2023-06-14",
      "completion_date": "2025-08-31",
      "has_results": false,
      "last_update_posted_date": "2025-01-10",
      "last_synced_at": "2026-11-15T00:05:12.224Z",
      "location_count": 1,
      "location_summary": "Washington D.C., District of Columbia",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05528939"
    }
  ]
}