1 Departments of Anesthesiology and Neurology and Center for Human Experimental Therapeutics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA University of Rochester, Rochester, NY, USA Stanford University, Palo Alto, CA, USA Johns Hopkins University, Baltimore, MD, USA Oregon Health and Science University, Portland, OR, USA Northwestern University, Chicago, IL, USA University of Wisconsin, Madison, WI, USA University of Kiel, Kiel, Germany Schmerzfachpraxis, Krefeld, Germany University of Washington, Seattle, WA, USA Universität Heidelberg, Mannheim, Germany Pain Matters, Liverpool, UK.