[1] Univ Pisa, Dept Clin & Expt Med, Unit Endocrinol, I-56100 Pisa, Italy
[2] Univ Pisa, Dept Surg Med Mol Pathol & Crit Area, Unit Endocrine Surg, I-56100 Pisa, Italy
[3] CNR, Clin Physiol Inst, I-56100 Pisa, Italy
[4] Univ Hosp Pisa, Sect Stat, I-56100 Pisa, Italy
[5] Univ Insubria, Dept Med & Surg, I-21100 Varese, Italy