         organSite:
             label: "Organ site (ICD code)"
             type: String
+            min: 1
 
         effectMeasure:
             label: "Measure of effect"
             type: String
+            min: 1
 
         effectUnits:
             label: "Units of effect measurement"

        "riskEstimates.$.exposureCategory":
            label: "Exposure category or level"
            type: String

        "riskEstimates.$.numberExposed":
            label: "Exposed cases/deaths"

        name:
            label: "Reference Short Name"
            type: String
            min: 1

        referenceType:
            label: "Reference Type"
