ACTIVE RELAPSING AND PROGRESSIVE MULTIPLE-SCLEROSIS PATIENTS HAVE SIMILAR MAGNETIC-RESONANCE-IMAGING BEHAVIOR - IMPLICATIONS FOR CLINICAL-TRIAL DESIGN - Noseworthy, J; Karlik, S; Wiebe, S; Hopkins, M; Vandervoort, M; Hewitt, L; Rice, G; Ebers, G; Lee, D (1990)