1. Department of Oncology, Clinical Hospital Center Split, School of Medicine, University of Split, Split, Croatia
2. Department of Oncology, St László Teaching Hospital, Budapest, Hungary
3. Medical University of Gdańsk, Gdańsk, Poland
4. Department of Medical Oncology, Tumor Center Aarau, Aarau, Switzerland
5. Department of Medicine I, Medical University of Vienna, Austria
6. University Clinic Golnik, Golnik, Slovenia
7. Institute of Oncology, Clinical Center, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
8. Department of Breast Tumors, Cancer Institute “Prof. Dr. I. Chiricuta” Cluj-Napoca, Romania
9. Oncology and Radiotherapy Clinic, Clinical Centre of Montenegro, Podgorica, Montenegro
10. Department of Oncology, University Hospital Motol, Charles University, Prague, Czech Republic
11. National Hospital of Oncology, Sofia, Bulgaria
12. Daily Chemotherapy Hospital, Institute for Oncology and Radiology of Serbia, Belgrade, Serbia
13. Oncology Institute, University Hospital Center Mother Teresa, Tirana, Albania
14. Institute University Clinic of Radiotherapy and Oncology, Ss. Cyril and Methodius University, Skopje, Macedonia
15. Biometrika Healthcare Research, Zagreb, Croatia
16. Oncology Division, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA