1. Department of Endocrinology, Children's Hosp. P. & A. Kyriakou, Athens, Greece;
2. Department of Hygiene, Epidemiology and Medical Statistics, University of Athens, Athens, Greece;
3. Department of Nutrition and Dietetics, Harokopio University of Athens, Athens, Greece;
4. School of Physical Education and Sports Science, University of Athens, Athens, Greece;
5. Department of Public and Community Health, University of West Attica, Athens, Greece