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M. G. Nikolova
Department of Hygiene, Medical Ecology and Nutrition, Faculty of Medicine,
Medical University – SofiaBulgaria
A. B. Penkov
Department of Hygiene, Medical Ecology and Nutrition, Faculty of Medicine,
Medical University – SofiaBulgaria
M. A. Boyanov
Clinic of Endocrinology and Metabolic Diseases
University Hospital “Alexandrovska”,
Department Internal Medicine, Faculty of Medicine,
Medical University – SofiaBulgaria