{"nct_id":"NCT00771043","title":"A Proof-of-Concept Study to Correlate Retinal Nerve Fiber Layer Changes in Patients With Multiple Sclerosis Treated With Natalizumab or Interferon Beta 1-a","status":"WITHDRAWN","status_verified_date":"2024-05","start_date":"2008-11-01","start_date_type":"ACTUAL","primary_completion_date":"2009-08-01","primary_completion_date_type":"ESTIMATED","completion_date":"2010-06-01","completion_date_type":"ESTIMATED","phases":["PHASE4"],"tickers":["BIIB"]}