{"nct_id":"NCT00323297","title":"Assess the Efficacy and Safety of Sildenafil When Added to Bosentan in the Treatment of Pulmonary Arterial Hypertension","status":"COMPLETED","status_verified_date":"2021-01","start_date":"2006-09","start_date_type":null,"primary_completion_date":"2013-08","primary_completion_date_type":"ACTUAL","completion_date":"2013-08","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["PFE"]}