Movement Disorders Unit, King’s College Hospital, University Hospital Lewisham, Guy’s, King’s and St Thomas’ School of Medicine, London; Unit of Neuroepidemiology, National Center for Epidemiology, Carlos III Institute of Health, Madrid, Spain; Royal Free Hospital Medical School and National Hospital for Neurology and Neurosurgery, Queen Square, London; Institute of Neurology, IRCCS NEUROMED, Pozzilli (IS), Italy; Medical College of Georgia, Augusta, Georgia, USA; Department of Neurology, Klinikum-Bremerhaven Reinkenheide, Bremerhaven, Germany; Department of Psychology, Institute of Psychiatry, King’s College London, London; Department of Neurology, Baylor College of Medicine, Houston, Texas, USA; Camborne-Redruth Hospital, Redruth, Cornwall; Southern General Hospital, Glasgow; University Hospital Lewisham, Lewisham, London; North Tyneside General Hospital, North Shields; University of Napoli, Naples, Italy; Assaf Harofeh Medical Center, School of Medicine, Tel-Aviv University, Zerifin, Israel
