1. Biophysics Program, University of Michigan, Ann Arbor, Michigan 48109, United States
2. Department of Chemistry, Biomedical Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
3. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Bruker Biospin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, United States
5. Department of Neurology, University of Michigan, Ann Arbor, Michigan 48109, United States
6. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
7. Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, Florida 32310, United States