1. Directorate of Research, Studies and Documentation, National Public Health Organization, Athens, Greece
2. First Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Alexandra General Hospital, Athens, Greece
3. Department of HIV Surveillance, National Public Health Organization, Athens, Greece
4. Healthcare Management Postgraduate Program, Open University of Cyprus, Nicosia, Cyprus
5. Department of Travel Medicine, National Public Health Organization, Athens, Greece
6. Therapeutic Clinic, Alexandra General Hospital, Athens, Greece
7. Neonatal Intensive Care Unit, Alexandra General Hospital, Athens, Greece
8. National Influenza Reference Laboratory of Southern Greece, Hellenic Pasteur Institute, Athens, Greece
9. First Department of Pediatrics, National and Kapodistrian University of Athens, Athens, Greece