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Contributors JRR wrote the first draft of the manuscript. All authors contributed to the interpretation and discussion of the content, and critically revised the drafted manuscript.
Funding The study was supported by the Spanish Ministry of Economy and Competitiveness, Fondo de Investigación Sanitaria del Instituto de Salud Carlos III (PI13/01393) Fondos Estructurales de la Unión Europea (FEDER), Spanish Ministry of Science and Innovation (RYC-2010–05957) by the Spanish Ministry of Education (FPU 13/04365). This study is part of a Ph.D. thesis conducted in the Biomedicine Doctoral Studies of the University of Granada, Spain.
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.
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