About the Authors
In-Vivo-NMR Laboratory, Max Planck Institute for Neurological Research, Cologne, Germany
Medres – Medical Research GmbH, Cologne, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: PBS TK MH SW. Performed the experiments: PBS TK LM. Analyzed the data: PBS TK LM. Contributed reagents/materials/analysis tools: PBS TK LM. Wrote the paper: PBS TK MH.