1. Pfizer Neuroscience and Pain Research Unit, The Portway Building, Granta Park, Cambridge CB21 6GS, UK.
2. University of Bristol, School of Physiology, Pharmacology, and Neuroscience, Bristol BS8 1TD, UK.
3. Hatherly College of Life and Environmental Sciences, University of Exeter, Prince of Wales Road, Exeter EX4 4PS, UK.
4. Yale Center for Neuroscience and Regeneration Research, Veterans Affairs Medical Center, 950 Campbell Avenue, Building 34,West Haven, CT 06516, USA.
5. Pfizer, 1 Howe Street, New Haven, CT 06511, USA.