Ferreira, Haroldo da Silva http://orcid.org/0000-0002-1789-3138
Article History
Received: 4 October 2019
Accepted: 22 January 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: The projects for the 2015 survey (process # 010102/0355) were approved by the Research Ethics Committee of the Federal University of Alagoas. The use of the database of the 1992 study was carried out with the consent of the holder of the rights of this material (Prof. Dr. Cesar Gomes Victora, from the Federal University of Pelotas, RS, Brazil).
: Not applicable.
: The author declares that he has no competing interests.