{"nct_id":"NCT00684671","title":"Evaluation of Immune Memory to Twinrix or Comparator by Challenge Dose Administration 4 Years After Primary Vaccination","status":"COMPLETED","status_verified_date":"2017-03","start_date":"2008-05-26","start_date_type":null,"primary_completion_date":"2008-11-03","primary_completion_date_type":"ACTUAL","completion_date":"2008-11-03","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["GSK"]}