Funding for this research was provided by:
Cancer Research UK
Received: 1 April 2021
Accepted: 21 July 2021
First Online: 3 August 2021
: Ethical approval was obtained from the Scientific Committee and the Ethics Research Committee of the University Hospital of Alexandroupolis (study approval number ES11-26-11-18). As the study is based on archival material and anonymity of patients was guaranteed, patient informed consent was waived by the ethics board. The study was conducted according to the criteria set by the Declaration of Helsinki.
: There are no individual person’s data included in the paper.
: The authors declare that they have no competing interests.