1. Cardiovascular Institute Dedinje, School of Medicine, University of Belgrade, Belgrade, Serbia
2. Department of Dermatology, Medical Centre Kikinda, Kikinda, Serbia
3. Faculty of Medicine, Institute of Medical Statistics and Informatics, University of Belgrade, Belgrade, Serbia
4. Second Propedeutic Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, Hippokration Hospital, Thessaloniki, Greece
5. Laboratory of Radiobiology and Molecular Genetics, Institute Vinca, University of Belgrade, Belgrade, Serbia