1 Department of Oncology, University of Ostrava, Ostrava, Czech Republic; Northumbria Healthcare NHS Trust, Newcastle upon Tyne, UK.
2 Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK.
3 Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK; Newcastle University, Newcastle upon Tyne, UK. Electronic address: [email protected].