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The contents of the manuscript have been tacitly or explicitly approved by the responsible authorities where the research was carried out.

Upon acceptation of the manuscript, the author agrees to allow its publication by Hypnos, declining pecuniary gains due from copyright. If the manuscript is published later in other media, the author agrees to always give credits of its first publication in Hypnos.

If the submitted document includes figures, tables, or large sections of text previously published, the author declares himself responsible for having obtained permission of the original copyright owners of these items for both the online and printed publication of this journal. Credits for copyrighted material must be properly attributed in the manuscript.