{"nct_id":"NCT00975507","title":"ProQuad™ Versus M-M-R II™ and VARIVAX™ in Healthy Children (V221-009)(COMPLETED)","status":"COMPLETED","status_verified_date":"2015-10","start_date":"1998-03","start_date_type":null,"primary_completion_date":"1999-01","primary_completion_date_type":"ACTUAL","completion_date":"1999-06","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["MRK"]}