1. Faculty of Medicine, University of Belgrade, Dr Subotića Starijeg 8, Belgrade, Serbia
2. Department of Gastroenterohepatology, Clinical and Hospital Center Bežanijska Kosa, Autoput s/n, 11080 Belgrade, Serbia
3. Department of Hematology, Clinical and Hospital Center Bežanijska Kosa, Autoput s/n, 11080 Belgrade, Serbia
4. Clinical and Hospital Center “Dr Dragiša Mišović-Dedinje”, Belgrade, Serbia
5. Institute of Anatomy “Niko Miljanić”, Dr Subotića Starijeg 4/2, Belgrade, Serbia