Ivan Adamec1, Mario Habek2,3. 1. Department of Neurology, University Hospital Center Zagreb, Referral Center for Autonomic Nervous System Disorders, Kišpatićeva 12, HR-10000, Zagreb, Croatia. 2. Department of Neurology, University Hospital Center Zagreb, Referral Center for Autonomic Nervous System Disorders, Kišpatićeva 12, HR-10000, Zagreb, Croatia. mhabek@mef.hr. 3. Department of Neurology, School of Medicine, University of Zagreb, Zagreb, Croatia. mhabek@mef.hr.