The authors wish to thank Dr. Elehu de Oliveira and the team of the Laboratory of Clinical Analysis (LAC) of the University Hospital of Santa Maria for the support provided.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This study was supported by the National Council for Scientific and Technological Development (CNPq/Brazil, number 476758/2012–2). The authors are grateful to CNPq/Brazil and Capes/Brazil for providing scholarships.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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