{"nct_id":"NCT00644605","title":"A Study to Assess the Efficacy and Safety of 20, 40, and 80mg of Sildenafil Three Times a Day in the Treatment of Pulmonary Arterial Hypertension","status":"COMPLETED","status_verified_date":"2021-01","start_date":"2002-10","start_date_type":null,"primary_completion_date":null,"primary_completion_date_type":null,"completion_date":"2003-11","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["PFE"]}