About the Authors
- Birgitte Hollegaard
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Contributed equally to this work with: Birgitte Hollegaard, Sean G. Byars
Affiliation Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
- Sean G. Byars
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Contributed equally to this work with: Birgitte Hollegaard, Sean G. Byars
Affiliation Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
- Jacob Lykke
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Affiliation Department of Obstetrics and Gynaecology, Roskilde Hospital, Roskilde, Denmark
- Jacobus J. Boomsma
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* E-mail: JJBoomsma@bio.ku.dk
Affiliation Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Helped plan and organize research: JL. Conceived and designed the experiments: JB BH SB. Performed the experiments: SB BH. Analyzed the data: BH SB. Wrote the paper: JB BH SB.