1. Italy
2. Department of Continuing Education; University of Oxford; Oxford Italy
3. Regional Epidemiology Unit SeREMI; Local Health Unit Alessandria- ASL AL; Alessandria Italy
4. Epidemiological System of the Veneto Region; Regional Center for Epidemiology, Veneto Region; Padova Italy
5. GCUH Library; Gold Coast Hospital and Health Service; Southport Australia
6. Department of Family Medicine, Faculty of Medicine; University of Calgary; Calgary Canada
7. S.S.D. Epidemiologia - Dipartimento di Prevenzione; ASL CN2 Alba Bra; Alba Italy