Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (471196/2010-0)
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (E-26/111.400/2010, E_14/2010)
Received: 21 February 2020
Revised: 14 July 2020
Accepted: 19 August 2020
First Online: 2 September 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The current study was performed in accordance with the guidelines of the Declaration of Helsinki. An informed consent for participation was thoroughly explained and signed by all participants. This study was approved by the Rio de Janeiro Federal University Maternity Teaching Hospital Ethics Committee (protocol number: 0023.0.361.000-08) and the Municipal Secretary of Rio de Janeiro Ethics Committee (protocol number: 0139.0.314.000-09).