{"nct_id":"NCT01333813","title":"Hepatitis B Antibody Persistence and Immune Response to Hepatitis B Vaccine Challenge in Previously Vaccinated Children","status":"COMPLETED","status_verified_date":"2016-08","start_date":"2011-04-26","start_date_type":null,"primary_completion_date":"2011-09-28","primary_completion_date_type":"ACTUAL","completion_date":"2011-09-28","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["GSK"]}