[ {
  "id" : {
    "studyAccession" : "SDY1",
    "pivotTable" : "Concomitant Medication",
    "pivotByTable" : "Concomitant Medication"
  },
  "totalCount" : 506,
  "armAccessions" : "ARM1; ARM2; ARM3; ARM4",
  "armCounts" : "114; 116; 157; 119"
}, {
  "id" : {
    "studyAccession" : "SDY1",
    "pivotTable" : "Subject",
    "pivotByTable" : "Subject"
  },
  "totalCount" : 159,
  "armAccessions" : "ARM1; ARM2; ARM3; ARM4",
  "armCounts" : "40; 40; 40; 39"
} ]