The midbrain to pons ratio: a simple and specific MRI sign of progressive supranuclear palsy.
Neurology. 2013 May 14;80(20):1856-61. doi: 10.1212/WNL.0b013e318292a2d2. Epub 2013 Apr 24.
Neurology. 2013.
PMID: 23616165
Free PMC article.