1. Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, National and Kapodistrian University of Athens, Agiou Thoma 17, 11527 Athens, Greece
2. Emergency Care Department, Laiko General Hospital, 11527 Athens, Greece
3. Second Department of Obstetrics and Gynecology, Medical School, “Aretaieion Hospital”, National and Kapodistrian University of Athens, 11528 Athens, Greece
4. Health Center of Nea Makri, 19005 Attica, Greece
5. Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
6. First Department of Respiratory Medicine, “Sotiria” Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
7. First Department of Cardiology, Hippokration General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
8. Third Department of Cardiology, Thoracic Diseases General Hospital Sotiria, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
9. Department of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, 41500 Larissa, Greece
10. Second Department of Psychiatry, ‘Attikon’ University Hospital, National and Kapodistrian University of Athens, 12462 Athens, Greece
11. First Department of Surgery, National and Kapodistrian University of Athens, Laikon General Hospital, 11527 Athens, Greece