1. 1 City Institute of Public Health Belgrade , Planning, Analysis and Organization of Health-Care , Bulevar Despota Stefana 54a, 11000 Belgrade , Serbia
2. 2 University of Belgrade , Faculty of Medicine, Institute of Social Medicine , 11000 Belgrade , Serbia
3. 3 University of Belgrade , Faculty of Pharmacy, Department of Social Pharmacy and Pharmaceutical Legislation , 11000 Belgrade , Serbia