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:Sildenafil therapy and exercise tolerance in idiopathic pulmonary fibrosis.  Idiopathic pulmonary fibrosis (IPF) is a form of idiopathic interstitial pneumonia characterized by temporally and spatially heterogeneous fibroblast proliferation and poor prognosis. No therapies have been shown in randomized clinical trials (RCT) to influence survival. Twenty-nine subjects were assigned randomly in a pilot study to a double-blind, placebo-controlled, RCT to test sildenafil in patients with IPF with forced vital capacity 40-90% and diffusing capacity 30-90% of predicted. During the 6-month experimental treatment period, patients underwent 6-min walk tests and estimation of dyspnea using the Borg scale at baseline (0 months), 3 months, and 6 months. Participants had moderate impairment of pulmonary function, and there were no significant differences between placebo (n = 15) and sildenafil (n = 14)-treated groups. Sildenafil did not significantly increase 6-min walk test distance (mean distance +/- SD after 6-month protocol: placebo 355 +/- 82 m, sildenafil 324 +/- 41 m; p = 0.256) nor did it lessen dyspnea after exercise (mean Borg score after 6-month protocol: placebo 3.4 +/- 1.6, sildenafil 4.1 +/- 2.3; p = 0.492). Adverse reactions were few and minor in nature. In this trial, sildenafil did not significantly increase 6-min walk test distance or decrease the Borg dyspnea index in patients with clinically typical IPF. This trial was registered at clinicaltrials.gov as NCT00359736. Output:
{'conditions': 'Alveolitis, Fibrosing|Fibrosis, Pulmonary|Hypertension, Pulmonary', 'interventions': 'Drug: sildenafil'}