1. Dipartimento di Medicina Sperimentale, Universitá dell'Aquila, L'Aquila, Italy
2. Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, U.S.A.
3. Divisione di Endocrinologia Pediatrica, Ospedale Regina Margherita, Turin, Italy