Received: 11 May 2020
Accepted: 12 January 2021
First Online: 22 January 2021
Ethics approval and consent to participate
: The study was approved by the Research Ethics Committees of Hospital de Clínicas of Porto Alegre and the Research Ethics Committees of Municipal Health Department of Porto Alegre, respectively, under the respective protocol numbers 2,940,235 and 3,153,671.The Term of Commitment for the Use of Secondary Data was signed for the ethical approval and availability of the two databases (Live Births Information System - SINASC) and the Mortality Information System - SIM)) by the Non transmissible Vital Events, Diseases and Aggravates Surveillance Team of the General Health Surveillance Coordination of the Porto Alegre Municipal Health Secretariat.
: Not applicable.
: The authors declare that they have no competing interests.