1 Department of Internal Medicine, University of Iowa, Iowa City, IA, United States.
2 Department of Epidemiology, University of Iowa, Iowa City, IA, United States.
3 Pacific Neuroscience Institute, Santa Monica, CA, United States.
4 Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, United States.
5 Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States.
6 Department of Neurology, Corinne Goldsmith Dickinson Center for Multiple Sclerosis, Icahn School of Medicine at Mount Sinai, New York, NY, United States.
7 Department of Neurology, University of Iowa, Iowa City, IA, United States.