[1] Univ Oxford, Nuffield Dept Clin Neurosci, Oxford, England
[2] Univ Maryland, Sch Nursing, Dept Pain Translat Symptom Sci, Baltimore, MA USA
[3] Univ Maryland, Placebo Opin Ctr, Sch Nursing, Baltimore, MA USA
[4] Univ Turin, Dept Psychol, Turin, Italy
[5] Univ Turin, Neurosci Inst Turin NIT, Turin, Italy