1. Department of Biology, Faculty of Veterinary Medicine , University of Belgrade , Bul. Oslobodjenja 18 , Belgrade , Serbia
2. Department of Animal Breeding, Faculty of Agriculture , University of Bijeljina , Pavlovica put bb, Bijeljina , Bosnia and Herzegovina
3. Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Center of Serbia, School of Medicine , University of Blegrade , Doktora Subotica 13 , Belgrade , Serbia
4. Institute of Public Health of Serbia “Dr Milan Jovanovic Batut” , Belgrade , Serbia