Gonçalves-Pinho, Manuel http://orcid.org/0000-0001-6098-429X
Ribeiro, João Pedro http://orcid.org/0000-0002-6596-3073
Freitas, Alberto http://orcid.org/0000-0003-2113-9653
Article History
First Online: 1 July 2020
Compliance with Ethical Standards
: Disclosure of potential conflicts of interest – The authors declare that they have no conflict of interest.
: Not applicable.
: All author authorize the publication of the manuscript.
: The data used was given by a Portuguese governmental agency guaranteeing all identification information was anonymous.
: No informed consent was needed once we used an administrative database built for hospital billing with no access to patients identification.