1 Directorate of Research, Studies, and Documentation, National Public Health Organization, Athens, Greece. Electronic address: [email protected].
2 Occupational Medicine, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy.
3 Infectious Diseases Department, CIC 1408 Inserm, University Hospital of Saint-Etienne, Saint-Etienne, France; University Chair PREVACCI, PRESAGE Institute, Saint-Etienne, France.