Received: 11 April 2019
Accepted: 24 September 2019
First Online: 10 October 2019
Ethics approval and consent to participate
: Since it was an observational, retrospective analysis of a previously anonymized database, informed consent was not obtained from patients. The study was approved by the ethics committee of Coimbra Hospital and University Centre.
: Not applicable.
: The authors declare that they have no competing interests.