Funding for this research was provided by:
Horizon 2020 Framework Programme (633666)
Cancer Research UK (C7923/A18525)
Received: 10 September 2018
Accepted: 22 February 2019
First Online: 7 March 2019
Ethics approval and consent to participate
: Only aggregated data publicly available from the Statistics Portugal office was used exempting special permissions for its use. No ethics approval was needed for this study.
: Not applicable.
: The authors declare that they have no competing interests.
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