Article History
Received: 17 November 2020
Revised: 15 February 2021
Accepted: 16 February 2021
First Online: 10 March 2021
Declarations
:
: Professor T. G. Villa, who is presenting this paper, and Professors Carmen Sieiro and Angeles Sánchez Pérez herewith give their consent of publication in the understanding that all ethic aspects have been met. Ethics committee is not necessary for this type of papers.
: The authors declare no competing interests.
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