1Harvard Medical School, Program in Placebo Studies, Beth Israel Deaconess Medical Center, 330 Brookline Avenue, Boston, MA 02115, USA
2Department of Clinical Psychology and Psychotherapy, Philipps-University of Marburg, Gutenbergstr. 18, 35032 Marburg, Germany
3Pain and Psychotherapy Research Lab, University of Koblenz-Landau, Ostbahnstr. 10, 76829 Landau, Germany
4Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
5Department of Psychiatry, Harvard Medical School, Brigham and Women's Hospital, 60 Fenwood Road, Boston, MA 02115, USA