About the Authors
- Michael K. McCall
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* E-mail: mccall@ciga.unam.mx
Affiliation CIGA, UNAM, Morelia, Michoacán, Mexico
- Noah Chutz
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Affiliation Independent Consultant, Silverton, CO, United States of America
- Margaret Skutsch
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Affiliation CIGA, UNAM, Morelia, Michoacán, Mexico
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Analyzed the data: MKM NC MS. Wrote the paper: MKM NC MS.