Received: 17 December 2018
Accepted: 9 October 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: The study was approved by the Research Ethics Committees of the Municipal Health Department of Porto Alegre and Hospital de Clínicas de Porto Alegre, respectively, under protocol numbers 52761816.9.3001.5338 and 16-0035.This manuscript does not contain any individual person’s data in any form (including individual details, images or videos).In the process for the approval of the two Research Ethics Committees, authorization for use of the databases of the two health information systems (Live Birth Information System and Mortality Information System) was done by signing a “Consent Form for the Use of Secondary Data” by the head of the General Coordination of Health Surveillance of the Municipal Health Department.
: Not applicable
: The authors declare that they have no competing interests.