{"nct_id":"NCT00335881","title":"Persistence of the Immune Response to Hepatitis B in 4-6 Years Old Children Previously Vaccinated With DTPa-HBV-IPV/Hib","status":"COMPLETED","status_verified_date":"2016-10","start_date":"2006-06","start_date_type":null,"primary_completion_date":null,"primary_completion_date_type":null,"completion_date":"2006-11","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["GSK"]}