{"nct_id":"NCT00550745","title":"ZOSTAVAX™ Safety Study in Subjects ≥ 60 Years of Age (V211-020)","status":"COMPLETED","status_verified_date":"2017-03","start_date":"2007-09","start_date_type":null,"primary_completion_date":"2009-01","primary_completion_date_type":"ACTUAL","completion_date":"2009-01","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["MRK"]}