Johnco C, Wuthrich VM, Brenes GA, Wetherell JL, Mohlman J. Evidence-based assessment of treatment outcomes for late-life generalized anxiety disorder using the Penn State Worry Questionnaire (PSWQ) and Penn State Worry Questionnaire - Abbreviated (PSWQ-A). Int Psychogeriatr. 2021 Apr 05; 1-13.