aNeurology Clinic, University Clinical Center of Serbia, School of Medicine, University of Belgrade, Serbia

bDysautonomia Center, NYU Langone Health, NYU Grossman School of Medicine, New York, New York, USA

Correspondence to Horacio Kaufmann, MD, Dysautonomia Center, NYU Langone Health, NYU Grossman School of Medicine, New York, 10016, USA. Tel: +1 212 263 7225; e-mail: [email protected]