1. Division of Endocrinology, Department of Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
2. Department of Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom.
3. Department of Endocrinology and Metabolism, Regina Apostolorum Hospital, Albano, Rome, Italy.
4. Department of Endocrinology, Odense University Hospital, Odense, Denmark.