1 Biohaven Pharmaceuticals, New Haven, CT 06510, USA. Electronic address: robert.croop@biohavenpharma.com.
2 National Institute for Health Research-Wellcome Trust King's Clinical Research Facility, King's College London, UK; Department of Neurology, University of California, San Francisco, San Francisco, CA, USA.
3 Biohaven Pharmaceuticals, New Haven, CT 06510, USA.
4 Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA.