1 Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, Salerno, Italy. Electronic address: pmonteleone@unisa.it.
2 Neuroendocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
3 Division of Pediatric Endocrinology, Department of Pediatrics, Massachusetts General Hospital for Children and Harvard Medical School, Boston, MA, USA.