{"nct_id":"NCT01556685","title":"MATRIX: Measuring Neutralizing Antibodies in the Patients Treated With Interferon Beta 1a IM, in Mexico and Colombia","status":"COMPLETED","status_verified_date":"2012-03","start_date":"2011-03","start_date_type":null,"primary_completion_date":"2011-10","primary_completion_date_type":"ACTUAL","completion_date":null,"completion_date_type":null,"phases":["PHASE4"],"tickers":["BIIB"]}