1 Department of Oncology, Clinical Hospital Centre Split, School of Medicine, University of Split, Split, Croatia. Electronic address: edo.vrdoljak@gmail.com.
2 King's College London, Institute of Cancer Policy, Department of Cancer and Pharmaceutical Studies, Guy's Hospital, Great Maze Pond, London SE1 9RT, UK. Electronic address: richard.sullivan@kcl.ac.uk.
3 Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Belfast BT9 7AE, UK. Electronic address: mark.lawler@qub.ac.uk.