About the Authors
- Raúl Jiménez
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* E-mail: rauljose.jimenez@uc3m.es
Affiliation Department of Statistics, Universidad Carlos III de Madrid, Getafe, Madrid, Spain
- Manuel Hidalgo
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Affiliation Department of Social Sciences, Universidad Carlos III de Madrid, Getafe, Madrid, Spain
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Analyzed the data: RJ. Wrote the paper: RJ MH.