[1] Univ Michigan, Dept Radiol, Ann Arbor, MI 48109 USA
[2] Michigan Radiol Qual Collaborat, Ann Arbor, MI USA
[3] Vet Affairs Ann Arbor Healthcare Syst, Ann Arbor, MI USA
[4] Univ Texas Southwestern Med Ctr Dallas, Dept Neurol & Neurotherapeut, Dallas, TX 75390 USA
[5] Cleveland Clin, Mellen Ctr, Dept Neurol, Cleveland, OH 44106 USA
[6] Univ Alabama Birmingham, Dept Neurol, Birmingham, AL 35294 USA
[7] Univ Virginia Hlth Syst, Dept Neurol, Charlottesville, VA USA
[8] Univ Michigan, Dept Neurol, Ann Arbor, MI USA