[1] University of Bologna,Department of Biomedical and Neuromotor Sciences, Unit of Hygiene, Public Health and Medical Statistics
[2] University of Pavia,Department of Public Health, Experimental and Forensic Medicine
[3] University of Palermo,Department of Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Excellence Specialties “G. D’Alessandro”
[4] London School of Hygiene and Tropical Medicine (LSHTM),School of Public Health, Faculty of Medicine and Health
[5] University of Washington,undefined
[6] University of Sydney,undefined