About the Authors

Joerg F. Schlaak

Contributed equally to this work with: Joerg F. Schlaak, Martin Trippler

joerg.schlaak@uni-due.de

Affiliation Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany

Martin Trippler

Contributed equally to this work with: Joerg F. Schlaak, Martin Trippler

Affiliation Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany

Carolina Hoyo-Becerra

Affiliation Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany

Yesim Erim

Affiliation Department of Psychosomatics, Rheinische Kliniken, Essen, Germany

Bernhard Kis

Affiliation Department of Psychiatry and Psychotherapy, LVR-Klinikum, Essen, Germany

Bo Wang

Affiliation Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany

Norbert Scherbaum

Affiliation Addiction Research Group at the Department of Psychiatry and Psychotherapy, LVR-Klinikum, Essen, Germany

Guido Gerken

Affiliation Department of Gastroenterology and Hepatology, University Hospital of Essen, Essen, Germany

Competing Interests

The authors have the following interests. Joerg Schlaak is a PLoS ONE Editorial Board member. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: JS. Performed the experiments: MT YE BK BW NS. Analyzed the data: JS MT CH. Contributed reagents/materials/analysis tools: MT YE BK. Wrote the paper: JS MT YE CH GG.