1. Hippokration General Hospital Aristotle University Thessaloniki Greece
2. National and Kapodistrian University Laiko General Hospital Athens Greece
3. University Hospital of Patras Patras Greece
4. Papageorgiou General Hospital of Thessaloniki Thessaloniki Greece
5. General Hospital of Nikaia Piraeus Greece
6. University Hospital of Ioannina Ioannina Greece
7. Hatzikosta General Hospital of Ioannina Ioannina Greece
8. Gennimatas General Hospital of Athens Athens Greece
9. Evaggelismos General Hospital Athens Greece
10. University Hospital of Larissa Larissa Greece
11. University Hospital of Heraklion Heraklion Crete Greece
12. University Hospital of Alexandroupolis Alexandroupoli Greece
13. Venizelio General Hospital of Heraklion Heraklion Crete Greece
14. General Hospital of Chania Chania Crete Greece
15. AHEPA University General Hospital Thessaloniki Greece
16. Attikon University Hospital National and Kapodistrian University Athens Greece
17. Aretaieio Hospital National and Kapodistrian University of Athens Athens Greece
18. Tzaneion General Hospital of Piraeus Athens Greece
19. Hellenic Red Cross Hospital Korgialeneio‐Benakeio Athens Greece
20. General Hospital of Rhodes Rhodes Greece
21. General Hospital of Drama Drama Greece
22. General Hospital of Thessaloniki ‘Agios Pavlos’ Thessaloniki Greece