1. Resident.
2. Attending.
3. Associate Professor.
4. Assistant Professor.
5. Research Associate.
6. Research Fellow, Fourth Department of Medicine, Attikon Hospital University of Athens Medical School.
7. Statistician.
8. Fellow.
9. Attending, Anesthesiology Department, Evangelismos Hospital, Athens, Greece.
10. Professor, Second Critical Care Department, Attikon Hospital and M. Simou Laboratory.
11. Professor.
12. Senior Lecturer, Section of Anesthetics, Pain Medicine and Intensive Care, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, United Kingdom.
13. Associate Professor, First Critical Care Department, Evangelismos Hospital and M. Simou Laboratory.