1. First Department of Internal Medicine, Medical School, “Laiko” General Hospital, National and Kapodistrian University of Athens, Athens, Greece
2. Medical School, University of Cyprus, Nicosia, Cyprus
3. Transmission Reduction Intervention Project, Athens site, Athens, Greece
4. National Development and Research Institutes, New York City, NY, USA
5. European University Cyprus, Nicosia, Cyprus
6. General Hospital of Athens “Evangelismos”, Athens, Greece
7. Department of Internal Medicine, Medical School, University General Hospital “Attikon”, National and Kapodistrian University of Athens, Athens, Greece
8. “Agioi Anargyroi” General Hospital, Athens, Greece
9. Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, Athens, Greece