About the Authors

Thomas Henzi

Affiliation Anatomy, Department of Medicine, University of Fribourg, Fribourg, Switzerland

Beat Schwaller

beat.schwaller@unifr.ch

Affiliation Anatomy, Department of Medicine, University of Fribourg, Fribourg, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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