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{
    "clinicalData": {
        "studyOID": "xxx",
        "metaDataVersionOID": "xxx",
        "itemGroupData": {
            "IG.DM": {
                "records": 600,
                "name": "DM",
                "label": "Demographics",
                "items": [                      
                    {"OID": "ITEMGROUPDATASEQ", "name": "ITEMGROUPDATASEQ", "label": "Record identifier", "type": "integer"},
                    {"OID": "IT.STUDYID", "name": "STUDYID", "label": "Study identifier", "type": "string", "length": 7}, 
                    {"OID": "IT.USUBJID", "name": "USUBJID", "label": "Unique Subject Identifier", "type": "string", "length": 3}, 
                    {"OID": "IT.DOMAIN", "name": "DOMAIN", "label": "Domain Identifier", "type": "string", "length": 2},
                    {"OID": "IT.AGE", "name": "AGE", "label": "Subject Age", "type": "integer", "length": 2}
                ],
                "itemData": [
                    [1, "MyStudy", "001", "DM", 56],
                    [2, "MyStudy", "002", "DM", 26],
                    ...
                ]
            }
        }
    },
    "referenceData": {
        ... Same structure as clinical data
    }
}