About the Authors

Joerg J. Meerpohl

Contributed equally to this work with: Joerg J. Meerpohl, Florian Herrle

meerpohl@cochrane.de

Affiliations German Cochrane Center, Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg, Freiburg, Germany, Pediatric Hematology and Oncology, Center for Pediatrics and Adolescent Medicine, University Medical Center Freiburg, Freiburg, Germany

Florian Herrle

Contributed equally to this work with: Joerg J. Meerpohl, Florian Herrle

Affiliations German Cochrane Center, Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg, Freiburg, Germany, Department of Surgery, University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany

Gerd Antes

Affiliation German Cochrane Center, Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg, Freiburg, Germany

Erik von Elm

Affiliations German Cochrane Center, Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg, Freiburg, Germany, Cochrane Switzerland, IUMSP, University Hospital Lausanne, Lausanne, Switzerland

Competing Interests

The authors have read the journal’s policy and have the following conflicts: They declare that they have no financial competing interests. Erik von Elm is a PLoS ONE Editorial Board Member. All of the authors are or have been involved with The Cochrane Collaboration, which produces systematic reviews. 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: JJM FH GA EvE. Performed the experiments: JJM FH. Analyzed the data: JJM FH EvE. Wrote the paper: JJM FH GA EvE.