About the Authors

Marcos Cruz

marcos.cruz@unican.es

Affiliation Department of Mathematics, Statistics and Computer Science, Univ. de Cantabria Av. Los Castros s/n, E-39005 Santander, Spain

Domingo Gómez

Affiliation Department of Mathematics, Statistics and Computer Science, Univ. de Cantabria Av. Los Castros s/n, E-39005 Santander, Spain

Luis M. Cruz-Orive

Affiliation Department of Mathematics, Statistics and Computer Science, Univ. de Cantabria Av. Los Castros s/n, E-39005 Santander, Spain

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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