1. Department of Pediatrics University Hospital of Pisa Pisa Italy
2. Pediatric Unit, Department of Surgical Science, Dentistry, Gynecology and Pediatrics Verona University Medical School Verona Italy
3. Electron Microscopy Unit, Department of Experimental and Clinical Medicine University Hospital of Ancona Ancona Italy
4. Department of Computer Science University of Pisa Pisa Italy
5. Unit of Molecular Genetics, Department of Laboratory Medicine University Hospital of Pisa Pisa Italy
6. Section of Cytogenetics, Department of Laboratory Medicine University Hospital of Pisa Pisa Italy
7. Department of Paediatric Respiratory Medicine Imperial College and Royal Brompton Hospital London UK