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The authors wish to acknowledge the sponsorship of the FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), CAPES (Coordenação Aperfeiçoamento de Pessoal de Nivel Superior) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), Process #443238/2014-6, #470388/2014-5. This work was also financed through the project UID/QUI/50006/2013, receiving support from the Portuguese Science and Technology Foundation, Ministry of Science and Education (FCT/MEC) through national funds, and co-financed by FEDER, under the Partnership Agreement PT2020.