De Graaff Hjalmar J, Wattjes Mike P, Rozemuller Annemieke J, Petzold Axel, Killestein Joep
MS Center Amsterdam, Department of Neurology, VU University Medical Center, Amsterdam, the Netherlands.
JAMA Neurol. 2013 Sep 1;70(9):1201. doi: 10.1001/jamaneurol.2013.3855.