{"nct_id":"NCT01251276","title":"Hepatitis B Challenge Dose in Adults (V232-059-10)","status":"COMPLETED","status_verified_date":"2022-08","start_date":"2010-11-30","start_date_type":"ACTUAL","primary_completion_date":"2011-04-12","primary_completion_date_type":"ACTUAL","completion_date":"2011-04-12","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["MRK"]}