1. Duke Clinical Research Institute, Duke Health, Durham, NC;
2. Department of Neurology, Wake Forest School of Medicine, Winston Salem, NC;
3. Bristol-Myers Squibb, Princeton, NJ;
4. University of California San Francisco, San Francisco, CA;
5. Uppsala Clinical Research Center and
6. Department of Medical Sciences, Cardiology, Uppsala University, Uppsala, Sweden;
7. Brazilian Clinical Research Institute, Sao Paulo, Brazil; and
8. Department of Neurology and Headache Center, University of Duisburg-Essen, Essen, Germany