1. Department of Anesthesiology, University of Thessaly, School of Health Sciences, Faculty of Medicine, Larisa, Greece
2. Outcomes Research Consortium, Cleveland, OH 44195, USA
3. Medical Supervision S.A. Private Medical Center, Athens, Greece
4. Department of Surgery, National and Kapodistrian University of Athens, 1st Propaedeutic Surgical Clinic, Athens, Greece
5. Department of Internal Medicine, Nikaia General Hospital, Nikaia, Greece
6. Department of Emergency Medicine, University of Thessaly, School of Health Sciences, Faculty of Medicine, Larisa, Greece
7. Department of Gastroenterology, Tzaneio General Hospital, Piraeus, Greece
8. Experimental-Research Center “ELPEN” Pharmaceutical Co, Athens, Greece
9. Department of Biopathology-Microbiology and Biochemistry, National and Kapodistrian University of Athens, Aretaieion University Hospital, Athens, Greece
10. Department of Respiratory Medicine, University of Thessaly, School of Health Sciences, Faculty of Medicine, Larisa, Greece
11. National and Kapodistrian University of Athens, Medical School, Laboratory for Research of the Musculoskeletal System, KAT General Hospital, Athens, Greece
12. European University Cyprus, School of Medicine, Nicosia, Cyprus