1. George Washington University School of Medicine, Washington, DC, USA
2. Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
3. Department of General Medicine, School of Medicine, University of Zenica, Zenica, Bosnia and Herzegovina
4. Department of Neurosurgery, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina
5. Department of Neurosurgery, University of Marburg, Marburg, Germany
6. School of Medicine, Josip Juraj Strossmayr University, Osijek, Croatia