About the Authors

Aaron G. Filler

To whom correspondence should be addressed. E-mail: afiller@earthlink.net

Affiliations Department of Anthropology, Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, United States of America, Department of Neurosurgery, Institute for Spinal Disorders, Cedars Sinai Medical Center, Los Angeles, California, United States of America

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AF. Performed the experiments: AF. Analyzed the data: AF. Contributed reagents/materials/analysis tools: AF. Wrote the paper: AF.