1. Gesundheitszentrum Odenwaldkreis, Internal medicine, Erbach, Germany
2. University of Belgrade, Faculty of Medicine, Institute of Medical Statistics and Informatics, Serbia
3. University of Sarajevo, Faculty of Medicine, Department of forensic medicine, Bosnia and Herzegovina
4. University of Priština (temporary residence in Kosovska Mitrovica), Faculty of Medicine, Institute for forensic medicine, Kosovo, Serbia