1. Department of Neurology, Referral Center for Autonomic Nervous System Disorders University Hospital Center Zagreb Zagreb Croatia
2. School of Medicine University of Zagreb Zagreb Croatia
3. Faculty of Medicine University of Belgrade Belgrade Serbia
4. Department of Neurology Medical University of Innsbruck Innsbruck Austria
5. Department of Neurology University Medical Centre Ljubljana Ljubljana Slovenia
6. Clinic of Neurology University Clinical Center of Serbia Belgrade Serbia
7. Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia