Neurology 2013 Dec 6;81(23):2051-3. Epub 2013 Nov 6.
From Newcastle University (C.L.A., A.M.S., P.R., K.J.K., E.L.B., L.H., K.C., R.H., D.M.T., G.S.G., R.W.T.), Newcastle upon Tyne, UK; Karolinska Institute (N.S., A.K.), Stockholm, Sweden; Hope Hospital (M.R.), Salford; and Royal Preston Hospital (A.V., J.N.), Preston, UK.