{"nct_id":"NCT01884935","title":"PK and PD Study of Natalizumab in Pediatric Subjects With RRMS","status":"COMPLETED","status_verified_date":"2015-01","start_date":"2013-07","start_date_type":null,"primary_completion_date":"2014-09","primary_completion_date_type":"ACTUAL","completion_date":"2014-09","completion_date_type":"ACTUAL","phases":["PHASE1"],"tickers":["BIIB"]}