1. Oregon Health and Science University, Department of Medicine, Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Neurological Surgery, and Pituitary Center, Portland, USA
2. University of Michigan Medical School, Department of Internal Medicine and Department of Pharmacology, Ann Arbor, USA
3. Università Federico II Di Napoli, Dipartimento Di Medicina Clinica E Chirurgia, Sezione Di Endocrinologia, Naples, Italy
4. Johns Hopkins University, Department of Medicine, Division of Endocrinology, and Pituitary Center, Baltimore, USA
5. Medical University-Sofia, Department of Endocrinology, Sofia, Bulgaria
6. Massachusetts General Hospital, Neuroendocrine and Pituitary Tumor Clinical Center, Boston, USA