1. Division of Endocrinology, Department of Medicine, University of Ioannina, Ioannina, Greece
2. Laboratory of Clinical Biochemistry, University of Ioannina, Ioannina, Greece
3. Laboratory of Radiology, University of Ioannina, Ioannina, Greece
4. Department of Epidemiology and Hygiene, University of Ioannina, Ioannina, Greece