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Contributors HCF, RdSdS and AJLAdC conceived, designed and supervised the study. TFC, RMC, JVC, CCT and RdBS undertook recruitment of patients and data collection. AP-B provided statistical advice on study design, and all authors analysed the data. TFC and HCF drafted the manuscript, and all authors contributed substantially to its revision. HCF takes responsibility for the paper as a whole.
Competing interests None declared.
Patient consent Not required.
Ethics approval The study was approved by the Institutional Review Board of Maternidade Escola da UFRJ, and D’Or Institute for Research & Education, Rio de Janeiro, RJ, Brazil.
Provenance and peer review Not commissioned; externally peer reviewed.
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