About the Authors
Department of Anthropology, University of Toronto at Mississauga, Mississauga, Ontario, Canada
Department of Pediatrics, University of Washington, Seattle, Washington, United States of America
School of Life Sciences, Fudan University, Shanghai, China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: LJ EJP. Performed the experiments: ME JT SL AG. Analyzed the data: ME AB LJ EJP. Contributed reagents/materials/analysis tools: ME AB JT KR EJP. Wrote the paper: ME EJP.