1. Autonomic Unit; National Hospital for Neurology and Neurosurgery (NHNN); London UK
2. Autonomic and Neurovascular Medicine Unit; Faculty of Medicine; Imperial College London at St Mary's Hospital; London UK
3. Research Institute for Sport and Exercise Sciences; Liverpool John Moores University; Liverpool UK
4. Clinic for Neurology and Clinical Neurophysiology; Centre of Research in Clinical Medicine (ZFKM); Helios clinic Wuppertal; University of Witten/Herdecke; Wuppertal Germany