1 Integrated System for Health, Social Assistance and Welfare, National Institute of Statistics (EG, LF), Rome, Italy. Electronic address: grande@istat.it.
2 Department of Pathophysiology and Transplantation, Università degli Studi di Milano (GA), Milano, Italy; Department of Paediatrics, Cystic Fibrosis Centre, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico (GA), Milano, Italy.
3 Statistical Service, Istituto Superiore di Sanità (MV), Rome, Italy.
4 Department of Neurosciences, Mental Health and Sensory Organs, Suicide Prevention Center, Sant'Andrea Hospital, Sapienza University of Rome, Rome (MP), Italy.
5 Integrated System for Health, Social Assistance and Welfare, National Institute of Statistics (EG, LF), Rome, Italy.