Guest User January 1, 1991 Robert T. Wertz, Nina F. Dronkers, J. K. Shapiro, Robert T. Knight, 1991 Relationship of lesion size and improvement in aphasia Guest User January 1, 1991 Robert T. Wertz, Nina F. Dronkers, J. K. Shapiro, Robert T. Knight, 1991 Authors:Robert T. WertzNina F. DronkersJ. K. ShapiroRobert T. KnightDate: 1991