1. Institute of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
2. Laboratory of Pain Mechanism Research, Hyogo Medical University, Hyogo, Japan
3. Department of Neurophysiology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
4. Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA, United States