1. Department of Neurology, Mellen Center for Multiple Sclerosis Treatment and Research, Cleveland Clinic, Cleveland, OH, USA,
2. Department of Neurology, Baird Multiple Sclerosis Center, Buffalo, NY, USA
3. Oregon Health & Science University, Portland, OR, USA
4. Biogen Idec, Inc., Wellesley, MA, USA
5. Department of Neurology, Mellen Center for Multiple Sclerosis Treatment and Research, Cleveland Clinic, Cleveland, OH, USA