1 From UCL Institute of Neurology (A.B., R.E., C.G., B.B., K.P.B., N.E.M.), London; National Hospital for Neurology and Neurosurgery (M.E.A.), London, UK; IRCCS Istituto Auxologico Italiano (R.E.), Dino Ferrari Center, Università degli Studi di Milano, Italy; and University Medical Center Hamburg-Eppendorf (C.G.), Hamburg, Germany.
2 From UCL Institute of Neurology (A.B., R.E., C.G., B.B., K.P.B., N.E.M.), London; National Hospital for Neurology and Neurosurgery (M.E.A.), London, UK; IRCCS Istituto Auxologico Italiano (R.E.), Dino Ferrari Center, Università degli Studi di Milano, Italy; and University Medical Center Hamburg-Eppendorf (C.G.), Hamburg, Germany. k.bhatia@ion.ucl.ac.uk.