1. Healthcare Workers Service, Regional Health Administration, Loreto Hospital
2. Occupational Medicine, Department of Molecular Pathology and Innovative Therapies, Polytechnic University of Marche
3. Centre of Epidemiology, Biostatistics and Medical Information Technology
4. Occupational Health Unit, United Hospitals of Ancona and Polytechnic University of Marche
5. Immunology Centre, Section of Nutrition, Immunity and Ageing, Research Department, Istituto Nazionale Riposo e Cura Anziani (INRCA)