1. Faculty of Geography, University of Belgrade , Studentski trg 3/III , Belgrade , Serbia
2. Department of Geography, Tourism and Hotel Management, Faculty of Sciences, University of Novi Sad , Trg Dositeja Obradovića 3 , Novi Sad , Serbia
3. Institute of Cardiovascular Diseases of Vojvodina, Clinic of Cardiology , Sremska Kamenica , Serbia
4. Military Geographical Institute, Ministry of Defence of the Republic of Serbia , Mije Kovačevića 5 , Belgrade , Serbia