Funding for this research was provided by:
Received: 9 October 2020
Accepted: 19 January 2021
First Online: 26 January 2021
: The research protocol was approved by the Ethics Committee Universidade Federal de São Paulo - Unifesp (CAAE # 86014518.9.0000.5505 – Escola Paulista de Medicina – Unifesp; approval 2.580929 on April 4, 2018). All data used in the research was provided by Fundação SEADE, the public state institution responsible for gathering demographic data of Live Births Certificates and Death Certificates of São Paulo State, Brazil. Administrative permission to use the database was provided by Fundação SEADE.
: not applicable.
: This manuscript is being submitted only to <i>BMC Pediatrics</i> and it will not be submitted elsewhere while under consideration. All authors listed on the manuscript approved the submission of this version of the manuscript and take full responsibility for the manuscript.
: Nothing to declare. Database use was possible due to FAPESP (Grant # 2017/03748-7) and due to agreements #23089.004297/2008-11 and #23089.000057/2014-95 between Fundação SEADE and Universidade Federal de São Paulo.