Received: 21 April 2019
Accepted: 23 July 2019
First Online: 1 August 2019
Ethics approval and consent to participate
: PNS was approved by the National Research Ethics Committee, under protocol number 328.159, on 26 June, 2013. All participants were informed and gave signed consent. This study was approved by the ethics committee of Albert Einstein Hospital, São Paulo, Brazil. All participants were informed and gave consent.
: Not applicable.
: The authors declare that they have no competing interests.