Department of Neurology, Merck Research Laboratory, West Point, PA 19486, USA;
Department of Neurology, Merck Research Laboratory, West Point, PA 19486, USA;
Department of Biologics Research, Merck Research Laboratory, West Point, PA 19486, USA;
Department of Neurology, Merck Research Laboratory, West Point, PA 19486, USA;
Department of Biologics Research, Merck Research Laboratory, West Point, PA 19486, USA;
Department of Neurology, Merck Research Laboratory, West Point, PA 19486, USA;