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First Online: 3 February 2020
Compliance with Ethical Standards
:
: All the procedures followed the ethical standards of the Committee of Ethics of the University of Santiago de Compostela (Spain) and the Ethics Committee of Clinical Research of Aragon (CEICA) (Spain) and the Declaration of Helsinki of 1975, revised in 2013. We obtained the informed consent of all participants included in the study.
: Víctor José Villanueva, Sara Puig-Pérez and Elisardo Becoña declare that they have no conflict of interest.
