Funding for this research was provided by:
Horizon 2020 Framework Programme (634446)
Received: 18 July 2019
Accepted: 18 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: This study corresponds to a secondary data analysis of the Hospital Discharge dataset, which is collected by the Health Systems Central Administration (Administração Central do Sistema de Saúde, ACSS). The ACSS provides anonymized data for epidemiological research. The anonymization implies the removal of any personal data. According to the National Ethics Committee for Clinical Research “Personal data that has been rendered anonymous in such a way that the person is not or no longer identifiable is no longer considered personal data and is therefore not covered by article 3 of the General Data Protection Regulation” (ExternalRef removed - page 2). For this reason the study protocol was not submitted to an ethical committee.
: Not applicable.
: The authors declare that they have no competing interests.