1. Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Republic of Serbia
2. Clinic for Surgical Oncology, Oncology Institute of Vojvodina, 21204 Sremska Kamenica, Republic of Serbia
3. Department for Neonatology, Institute for Child and Youth Health Care of Vojvodina, 21000 Novi Sad, Republic of Serbia