1. Consultants in Neurology Multiple Sclerosis Center Northbrook Illinois USA
2. University of Cincinnati Waddell Center for Multiple Sclerosis Cincinnati Ohio USA
3. Department of Neurosciences University of Toledo Toledo Ohio USA
4. Mallinckrodt Pharmaceuticals Hampton New Jersey USA
5. Mellen MS Center Cleveland Clinic Cleveland Ohio USA
6. Department of Neurology University of South Florida Tampa Florida USA
7. Icahn School of Medicine at Mount Sinai Hospital New York New York USA