Received: 30 August 2019
Accepted: 7 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: The projects for 2005 (process # 010102/0355) and 2015 surveys (process # 09093012.0.0000.5013) were approved by the Research Ethics Committee of the Federal University of Alagoas. Written informed consent to participate was obtained from all children’s mothers or guardians before data collection. 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 authors declare that they have no conflict of interest.