About the Authors

H. Felix Fischer

felix.fischer@charite.de

Affiliation Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, Berlin, Germany

Sylvia Binting

Affiliation Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, Berlin, Germany

Angelina Bockelbrink

Affiliation Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, Berlin, Germany

Peter Heusser

Affiliation Chair for Theory of Medicine, Integrative and Anthroposophic Medicine, Faculty of Health, Witten/Herdecke University, Germany

Christoph Hueck

Affiliation Freie Hochschule Stuttgart – Seminar für Waldorfpädagogik, Stuttgart, Germany

Thomas Keil

Affiliation Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, Berlin, Germany

Stephanie Roll

Affiliation Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, Berlin, Germany

Claudia Witt

Affiliation Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, Berlin, Germany

Competing Interests

The authors have the following interest. Christoph Hueck is employed by Freie Hochschule Stuttgart, one of the funders of this study. This does not alter their adherence to all the PLOS ONE policies on sharing data and materials, as detailed online in the guide for authors.

Author Contributions

Conceived and designed the experiments: AB PH CH SR TK CW HFF. Performed the experiments: SB AB HFF. Analyzed the data: HFF SR TK CW. Wrote the paper: HFF SB PH CH SR TK CW.