About the Authors

Pål O. Westermark

pal-olof.westermark@charite.de

Affiliation Institute for Theoretical Biology, Charité –Universitätsmedizin Berlin, Berlin, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: POW. Performed the experiments: POW. Analyzed the data: POW. Wrote the paper: POW.