1 Section of Neurobiology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089-2520, USA.
2 PTC Therapeutics, Inc., South Plainfield, NJ 07080, USA.
3 F. Hoffmann-La Roche Ltd, Pharmaceutical Research and Early Development, Roche Innovation Center Basel, Grenzacherstrasse 124, 4070 Basel, Switzerland.
4 SMA Foundation, 888 Seventh Avenue, Suite 400, New York, NY 10019, USA.