{"nct_id":"NCT00159887","title":"Study to Assess the Longterm Safety of Sildenafil Citrate in Patients With Pulmonary Arterial Hypertension","status":"COMPLETED","status_verified_date":"2021-01","start_date":"2002-12","start_date_type":null,"primary_completion_date":null,"primary_completion_date_type":null,"completion_date":"2007-02","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["PFE"]}