1. Arthritis Research UK Pain Centre; University of Nottingham, Medical School, Queen's Medical Centre; Nottingham UK
2. School of Life Sciences; University of Nottingham, Medical School, Queen's Medical Centre; Nottingham UK
3. Centre for Analytical Bioscience, School of Pharmacy; University of Nottingham; Nottingham UK
4. The Skaggs Institute for Chemical Biology and Department of Chemical Physiology; The Scripps Research Institute; La Jolla CA USA
5. Committee of Neurobiology of Addictive Disorders; The Scripps Research Institute; La Jolla CA USA