About the Authors

Kathryn T. Hall

kthall@bidmc.harvard.edu

Affiliations Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America

Anthony J. Lembo

Affiliations Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Gastroenterology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America

Irving Kirsch

Affiliations Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, School of Psychology, University of Plymouth, Devon, United Kingdom

Dimitrios C. Ziogas

Affiliation Department of Internal Medicine, University of Athens, Athens, Greece

Jeffrey Douaiher

Affiliation Department of Surgery, Johns Hopkins, Baltimore, Maryland, United States of America

Karin B. Jensen

Affiliations Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America

Lisa A. Conboy

Affiliation Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America

John M. Kelley

Affiliations Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, United States of America, Endicott College, Beverly, Massachusetts, United States of America

Efi Kokkotou

Affiliations Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, Department of Gastroenterology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America

Ted J. Kaptchuk

Affiliations Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America, Program in Placebo Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Hypothesis generation: KJ KH TK. Managed genotyping: KH DZ JD. Experimental design: AL KH KJ TK EK KJ. Data analysis: KH AL TK IK JK LC. Manuscript preparation: KH JD TK EK JK IK.