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This fee covers costs for: professional copyediting; immediate publication quickly upon acceptance; different formats of publication (HTML, XML, PDF); inclusion in many archives as PubMed, Scopus, DOAJ, EBSCO, Clarivate, CAS, among others. Please note that our fee does not include taxes; private residents in the European union must add 4% Value-Added Tax (VAT). Institutions and Organizations paying the fee on behalf of authors can avoid payment of VAT providing their VAT registration number.