Received: 5 February 2019
Accepted: 13 September 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: The Institutional Review Board at the University of Georgia approved this study. Ethical approval for data use from the Croatian National Cancer Registry was obtained from the ethics committee of the Croatian National Institute of Public Health.
: Not applicable.
: The authors declare that they have no competing interests.