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Contributors FJA-G contributed to the design and implementation of the research, to the analysis of the results and to the writing of the manuscript.
Funding The author of the current manuscript was supported by the Spanish Ministry of Education, Culture and Sports (FPU14/04172).
Competing interests None declared.
Patient consent for publication Not required.
Ethics approval Ethics Committee on Human Research of the Regional Government of Andalusia (0838-N-2017).
Provenance and peer review Not commissioned; externally peer reviewed.