1. Clinic of Dermatovenereology, School of Medicine, Military Medical Academy, Belgrade, Republic of Serbia
2. Clinic of Dermatovenereology, Clinical Center of Niš, Faculty of Medicine, University of Niš, Republic of Serbia
3. Clinic of Dermatovenereology, Clinical Center of Serbia, Faculty of Medicine, University of Belgrade, Republic of Serbia
4. Clinic of Dermatovenereology, Clinical Center of Vojvodina, Faculty of Medicine, University of Novi Sad, Republic of Serbia