From the Center of Epidemiology and Health Surveillance & Promotion (A.P.), Italian National Institute of Health, Rome, Italy; Department of Psychiatric Science and Psychological Medicine (F.B., L.T., M.Biondi), University “La Sapienza” of Rome, Italy; Occupational Health Unit (M.Baldassari), United Hospitals of Ancona and Politechnic University of Marche, Ancona, Italy; Healthcare Workers Service (A.C.), Regional Health Administration, Ancona, Italy; Immunology Center, Section Nutrition, Immunity and Aging, Research Department (E.M.), Istituto Nazionale Riposo e Cura Anziani, Ancona, Italy.