1. From the IRCCS Fondazione Don Gnocchi (L.D.I.), Milan, Italy; Neurocenter (J.M.V.), Luzerner Kantonsspital, Lucerne, Switzerland; Medical Library (J.C.F.K.), Amsterdam University Medical Centre, Department of Rehabilitation Medicine (G.K.), Amsterdam University Medical Centre, Amsterdam Movement Sciences, Amsterdam Neuroscience, the Netherlands; and Department of Physical Therapy and Human Movement Sciences (G.K.), Feinberg School of Medicine, North-Western University, Chicago, IL.