{
  "resourceType": "ResearchStudy",
  "id": "example",
  "title": "Example study",
  "protocol": {
    "reference": "PlanDefinition/pdf1"
  },
  "partOf": {
    "reference": "ResearchStudy/rsd1"
  },
  "status": "completed",
  "category": [
    {
      "coding": [
        {
          "code": "GENE",
          "display": "Gene expression"
        }
      ]
    }
  ],
  "focus": [
    {
      "coding": [
        {
          "code": "PRC",
          "display": "Prostate cancer"
        }
      ]
    }
  ],
  "keyword": [
    {
      "text": "Prostate cancer",
      "coding": [
        {
          "code": "PRC",
          "display": "Prostate cancer"
        }
      ]
    },
    {
      "text": "Gene expression research",
      "coding": [
        {
          "code": "GENE",
          "display": "Gene expression"
        }
      ]
    }
  ],
  "contact": [
    {
      "name": "Professor Brand",
      "telecom": [
        {
          "system": "phone",
          "value": "+31715269702",
          "use": "work"
        }
      ]
    }
  ],
  "period": {
    "start": "2015-02-01",
    "end": "2015-02-21"
  },
  "enrollment": [
    {
      "reference": "Group/enr1"
    },
    {
      "reference": "Group/enr2"
    }
  ],
  "sponsor": {
    "reference": "Organization/spn1"
  },
  "principalInvestigator": {
    "reference": "Practitioner/pnv1"
  },
  "site": [
    {
      "reference": "Location/st1"
    },
    {
      "reference": "Location/st2"
    }
  ],
  "note": [
    {
      "text": "Example comment 1"
    },
    {
      "text": "Example comment 2"
    }
  ],
  "description": "Example markdown list:\n* abc\n* def",
  "arm": [
    {
      "name": "Study arm 1",
      "code": {
        "coding": [
          {
            "code": "GENE",
            "display": "Gene expression"
          }
        ]
      },
      "description": "Study arm 1 description"
    },
    {
      "name": "Study arm 2",
      "code": {
        "coding": [
          {
            "code": "PRC",
            "display": "Prostate cancer"
          }
        ]
      },
      "description": "Study arm 2 description"
    }
  ]
}