1. Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan - Italy
2. Department of Sciences for the Health Promotion and Mother and Child Care “G. D'Alessandro,” Hygiene Section, University of Palermo, Palermo - Italy
3. Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità, Rome - Italy
4. Istituto DOXA, Worldwide Independent Network/Gallup International Association (WIN/GIA), Milan - Italy
5. Department of Epidemiology, IRCCS - Istituto di Ricerche Farmacologiche “Mario Negri,” Milan - Italy