{"description":"No patients received treatment, therefore no adverse events were reported.","eventGroups":[{"description":"Participant previously had acute lymphoblastic leukemia or brain tumor to be treated with Methylphenidate or Placebo - Administered 1 capsule each day for 1 week, .3 mg/kg dose.","id":"EG000","otherNumAffected":0,"otherNumAtRisk":0,"seriousNumAffected":0,"seriousNumAtRisk":0,"title":"Participant With Attention Deficit"}],"frequencyThreshold":"5"}