Received: 9 June 2019
Accepted: 30 April 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Regional Health Authority for Northern Portugal, that also gave permission to waive individual informed consent for data access, with all the patient data de-identified prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests.