1 Pharmacology and Therapeutics Department,Central Modulation of Pain, Institute of Psychiatry, Psychology, and Neuroscience, King's College London, London, United Kingdom.
2 Department of Health Science and Technology, Center for Neuroplasticity and Pain (CNAP), Faculty of Medicine, Aalborg University, Aalborg, Denmark.
3 Department of Pharmacology, University of Arizona, Tucson, AZ, United States.