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:Randomised, double-blind, placebo-controlled study of tacrolimus in myasthenia gravis.  To evaluate the ability of tacrolimus to reduce the corticosteroid dose in patients with myasthenia gravis (MG) and the drug's safety in a double-blind, placebo-controlled, parallel group study. Patients being treated with oral prednisolone at doses equivalent to 10-20 mg/day, and with stable symptoms, were randomised to tacrolimus or placebo in a 28-week double-blind study. The dose of corticosteroid was tapered with the procedures specified in the protocol. The primary efficacy endpoint was the mean daily prednisolone dose given in the last 12&emsp14;weeks of the study. Eighty patients received the study drug (40 patients in each group) and were included in the full analysis set. In the full analysis set, there was no significant difference in the primary efficacy endpoint between the two groups (p = 0.078). However, some secondary analyses suggested the steroid-sparing effect of tacrolimus. Tacrolimus was well tolerated, and no safety concerns were noted. This study suggests that tacrolimus has a potential advantage as a steroid-sparing agent in the treatment of MG patients. NCT00309088. Name of the trial registry: FK506 Phase 3 STUDY: A STUDY for Steroid Non-Resistant MG Patients. Output:
{'conditions': 'Myasthenia Gravis', 'interventions': 'Drug: tacrolimus|Drug: placebo'}