1. Department of Nuclear Medicine, Clinical Center and Medical Faculty Kragujevac, Kragujevac, Serbia.
2. Department of Pharmacology, Clinical Center and Medical Faculty Kragujevac, Kragujevac, Serbia.
3. Department of Nuclear Medicine, General Hospital Ċuprija, Ċuprija, Serbia.
4. Department of Nuclear Medicine, Clinical Center and Medical Faculty Niš, Niš, Serbia.