1. Older onset essential tremor : more rapid progression and more degenerative pathology Louis, Elan D.; Faust, Phyllis L.; Vonsattel, Jean Paul; Honig, Lawrence S.; Henchcliffe, Claire; Pahwa, Rajesh; Lyons, Kelly E.; Rios, Eileen; Erickson-Davis, Cordelia; Moskowitz, Carol Brown; Lawton, Arlene 2009 Articles Neurosciences