1. Clinic for Mental Disorders “Dr Laza Lazarević”, 11000 Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
3. Institute of Medical and Clinical Biochemistry, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
4. Faculty of Medicine, University of Priština—Kosovska Mitrovica, 38220 Kosovska Mitrovica, Serbia
5. Clinic for Neurology, University Clinical Centre of Niš, 18000 Niš, Serbia
6. Institute for Medical Statistics and Informatics, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
7. Department for Internal Medicine, Mayo Clinic, Rochester, MN 55905, USA