About the Authors

Nicola Dimitri

dimitri@unisi.it

Affiliation Department of Political Economy and Statistics, University of Siena, Siena, Italy

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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