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:Equal efficacy of endoscopic variceal ligation and propranolol in preventing variceal bleeding in patients with noncirrhotic portal hypertension.  Variceal bleeding increases morbidity and mortality among patients with noncirrhotic portal hypertension (NCPH). Blockers of β-adrenergic receptor signaling and endoscopic variceal ligation (EVL) have been used to prevent recurrence of bleeding, based on data from cirrhotic patients. We compared the efficacy and safety of the β-blocker propranolol with that of EVL in preventing the recurrence of variceal bleeding in patients with NCPH. Consecutive patients with NCPH with a history of variceal bleeding in the past 6 weeks were assigned randomly to groups treated every 3 weeks with EVL (n = 51) or propranolol (until they had a resting heart rate of 55 beats per minute or to a maximum of 320 mg/day; n = 50). Primary end points were recurrence of variceal bleeding or death. Secondary end points were complications of EVL in patients given EVL, variceal eradication after EVL, variceal recurrence after EVL, or a decrease in variceal grade in patients given propranolol. After a median follow-up period of 23 months, rates of recurrence of bleeding were similar between the groups (EVL, 23.5%; propranolol, 18%; P = .625). The actuarial probability of remaining free of bleeding recurrence was similar between the groups. No deaths occurred in either group. Of the patients given propranolol, 47% had a decrease in the grade of varices and none experienced bleeding. Adverse events were minor and comparable between groups (EVL, 12%; propranolol, 18%; P = .635). EVL was not more effective than the β-blocker propranolol for the secondary prophylaxis of variceal bleeding in patients with NCPH. Output:
{'conditions': 'Non Cirrhotic Portal Hypertension', 'interventions': 'Drug: Propranolol|Device: multi band ligator for esophageal varices'}