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Contributors Both authors contributed equally to this article.
Funding This study was funded by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (PPM-00428-17) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (465518/2014-1 and 310679/2016-8).
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Commissioned; internally peer reviewed.