1. Department of Cellular and Molecular Biology, Xenon Pharmaceuticals, Burnaby, BC V5G 4W8, Canada
2. Neurocrine Biosciences, San Diego, California 92130, United States
3. Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
4. Department of Neurology, Yale University, New Haven, Connecticut 06519, United States