1. Pediatric and Adolescent Endocrinology, Pediatrics Unit, Azienda Ospedaliero Universitaria Pisana, 56126 Pisa, Italy
2. Molecular Genetics Laboratory, Azienda Ospedaliero Universitaria Pisana, 56126 Pisa, Italy
3. Chemistry and Endocrinology Laboratory, Azienda Ospedaliero Universitaria Pisana, 56126 Pisa, Italy