About the Authors
- Johannes Friedrich, Robert Urbanczik, Walter Senn
- Department of Physiology, University of Bern, Bern, Switzerland
The authors have declared that no competing interests exist.
Conceived and designed the experiments: RU WS. Performed the experiments: JF. Analyzed the data: JF. Contributed reagents/materials/analysis tools: JF RU. Wrote the paper: RU WS.