TY  - RPRT
TI  - Exploratory treatment trials in multiple sclerosis using MRI: sample size calculations for relapsing-remitting and secondary progressive subgroups using placebo controlled parallel groups.
AU  - N Tubridy
AU  - H J Ader
AU  - F Barkhof
AU  - A J Thompson
AU  - D H Miller
PY  - 1998
DO  - 10.1136/jnnp.64.1.50
UR  - https://pubmed.ncbi.nlm.nih.gov/9436727/
ID  - 9436727
ER  -