1. Department of Pediatrics, Castelli Hospital, Verbania, Italy
2. Associazione Bambini Cri du Chat (ABC), S. Casciano in Val di Pesa, Florence, Italy
3. Child Neuropsychiatry Unit, Department of Brain and Behavioural Sciences, University of Pavia, Pavia, Italy
4. Laboratory of Human Genetics, E.O. Hospital Galliera, Genova, Italy
5. Department of Brain and Behavioural Sciences, University of Pavia, Pavia, Italy
6. Department of Molecular Medicine, University of Pavia and IRCCS, S. Matteo, Pavia, Italy