{"nct_id":"NCT00635128","title":"Safety and Immunogenicity of a Booster Dose of GSK Biological's Boostrix-Polio Vaccine","status":"COMPLETED","status_verified_date":"2017-04","start_date":"2008-02-01","start_date_type":"ACTUAL","primary_completion_date":"2008-07-08","primary_completion_date_type":"ACTUAL","completion_date":"2008-07-08","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["GSK"]}