Your goal is to extract structured information from the user's input that matches the form described below. When extracting information please make sure it matches the type information exactly. Do not add any attributes that do not appear in the schema shown below.

```TypeScript

 { // Information on the clinical trial characteristics from the abstract
 conditions: string // The condition or disease being treated in the clinical trial
 drug_or_intervention: string // The drug or intervention used in the clinical trial
}
```


Please output the extracted information in JSON format. Do not output anything except for the extracted information. Do not add any clarifying information. Do not add any fields that are not in the schema. If the text contains attributes that do not appear in the schema, please ignore them. All output must be in JSON format and follow the schema specified above. Wrap the JSON in <json> tags.



Input:Randomized non-inferiority trial of the vitalHEAT temperature management system vs the Bair Hugger warmer during total knee arthroplasty.  Intraoperative and postoperative hypothermia occur commonly; mild hypothermia (34-36 degrees C) is associated with adverse events. The use of perioperative warming devices has become routine, but currently available active warming devices may be limited in certain circumstances. The vitalHEAT Temperature Management System provides conductive warming (circulating warm water) around a single extremity together with a vacuum that is applied to the limb. In this randomized trial, we tested the hypothesis that the vitalHEAT system is non-inferior to the Bair Hugger during unilateral total knee arthroplasty. Physical status I-III patients who were >or=18 yr-old were eligible to participate. The patients were randomly assigned to the vitalHEAT system (n = 30) or to Bair Hugger (n = 25) warming. Intraoperative and first recovery room temperatures were recorded in both groups. The baseline characteristics of the groups were similar. In terms of the primary outcome measure, i.e., sublingual temperature measured within 10 min of recovery room arrival, the vitalHEAT system did not meet the criterion for non-inferiority. Specifically, the confidence interval for the difference between means included the non-inferiority margin (-0.5 degrees C). In terms of the secondary measures, i.e., intraoperative esophageal temperatures, the vitalHEAT system also underperformed compared with the Bair Hugger. The vitalHEAT system may have advantages over convective warming systems because it requires a much smaller body surface area; however, in this study of warming during total knee arthroplasty, it underperformed when compared with the Bair Hugger, especially around and after the time of tourniquet release. NCT00711867. Output:
{'conditions': 'Total Knee Arthroplasty', 'interventions': 'Device: VH2|Device: Bair Hugger'}