TY - RPRT TI - Defining multiple sclerosis disease activity using MRI T2-weighted difference imaging. AU - M A Lee AU - S Smith AU - J Palace AU - P M Matthews PY - 1998 DO - 10.1093/brain/121.11.2095 UR - https://pubmed.ncbi.nlm.nih.gov/9827769/ ID - 9827769 ER -