About the Authors
- Per Christiansen
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* E-mail: p2christiansen@zmuc.ku.dk
Affiliation Department of Vertibrates, Zoological Museum, Copenhagen, Denmark
Competing Interests
The author has declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: PC. Performed the experiments: PC. Analyzed the data: PC. Contributed reagents/materials/analysis tools: PC. Wrote the paper: PC.