Manipulation of expectancy and anxiety in placebo research and their effects on opioid-induced analgesia.
Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, 68159 Mannheim, Germany. maike.mueller@zi-mannheim.de
Maike
M
Mueller
Espen
E
Bjørkedal
Sandra
S
Kamping