About the Authors

Michael Linnebank

michael.linnebank@ usz.ch

Affiliations Department of Neurology, University Hospital Bonn, Bonn, Germany, Department of Neurology, University Hospital Zurich, Zurich, Switzerland

Susanna Moskau

Affiliation Department of Neurology, University Hospital Bonn, Bonn, Germany

Alexander Semmler

Affiliations Department of Neurology, University Hospital Bonn, Bonn, Germany, Department of Neurology, University Hospital Zurich, Zurich, Switzerland

Barbara Hoefgen

Affiliation Department of Psychiatry, University Hospital Bonn, Bonn, Germany

Gisela Bopp

Affiliation Department of Psychiatry, University Hospital Bonn, Bonn, Germany

Ulf Kallweit

Affiliation Department of Neurology, University Hospital Zurich, Zurich, Switzerland

Wolfgang Maier

Affiliation Department of Psychiatry, University Hospital Bonn, Bonn, Germany

Christian G. Schütz

Affiliations Department of Psychiatry, University Hospital Bonn, Bonn, Germany, Institute of Mental Health, University of British Columbia, Vancouver, Canada

Ullrich Wüllner

Affiliation Department of Neurology, University Hospital Bonn, Bonn, Germany

Competing Interests

ML is member of the D.A.CH Liga homocysteine which is an expert board of homocysteine metabolism sponsored by pharmaceutical companies that are involved in vitamin supplement production, and works as an expert consultant for Desitin within a project on vitamin supplementation. All other authors declare that no competing interests exist. 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: ML SM WM CGS UW. Performed the experiments: ML SM AS BH GP UK . Analyzed the data: ML AS BH GP UK CGS . Contributed reagents/materials/analysis tools: ML SM WM CGS UW. Wrote the paper: ML SM UK WM UW.