{"nct_id":"NCT00519649","title":"Long-term Persistence of Immunity Against Hepatitis B in 7-8 Years Old Children After Hepatitis B Vaccination.","status":"COMPLETED","status_verified_date":"2016-11","start_date":"2007-08-31","start_date_type":null,"primary_completion_date":"2007-12-31","primary_completion_date_type":"ACTUAL","completion_date":"2007-12-31","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["GSK"]}