Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (Grant PTDC/SAU- ONC/115513/2009_FCOMP-01-0124-FEDER-015949)
Text and Data Mining valid from 2019-11-12
Received: 2 August 2019
Accepted: 31 October 2019
First Online: 12 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Institutional ethics committees of S. João and Braga Hospitals (Approval 29/10/2007).
: Not applicable. This is a retrospective study where any information that allows participants identification is not disclosed.