{
  "_note": "Synthetic metadata describing Korean public DKD-relevant cohorts. NOT real cohort data.",
  "cohorts": [
    {"id": "K-DPP", "name": "Korean Diabetes Prevention Program", "n": 14000, "dkd_subset_n": 2200, "biomarker_coverage": ["UACR","EGFRSLOPE","UACRV"], "sites_kr": 18, "feasibility_score": 0.78},
    {"id": "KNOW-CKD", "name": "KoreaN cohort study for Outcome in CKD", "n": 2238, "dkd_subset_n": 760, "biomarker_coverage": ["UACR","EGFRSLOPE","FGF23","KIM1","NGAL"], "sites_kr": 9, "feasibility_score": 0.92},
    {"id": "NHIS-NSC", "name": "NHIS National Sample Cohort", "n": 1025340, "dkd_subset_n": 64000, "biomarker_coverage": ["UACR","EGFRSLOPE"], "sites_kr": 0, "feasibility_score": 0.65},
    {"id": "HIRA", "name": "HIRA claims database", "n": 50000000, "dkd_subset_n": 1800000, "biomarker_coverage": [], "sites_kr": 0, "feasibility_score": 0.55},
    {"id": "KDA-REG", "name": "KDA diabetes registry", "n": 36000, "dkd_subset_n": 11000, "biomarker_coverage": ["UACR","EGFRSLOPE","UACRV"], "sites_kr": 47, "feasibility_score": 0.88}
  ]
}