Feltner D, Hill C, Lenderking W, Williams VS, Morlock R. Development of a patient-reported assessment to identify placebo responders in a generalized anxiety disorder trial. J Psychiatr Res. 2009 Oct;43(15):1224-30.
Morlock RJ, Williams VS, Cappelleri JC, Harness J, Fehnel SE, Endicott J, Feltner D. Development and evaluation of the Daily Assessment of Symptoms – Anxiety (DAS-A) Scale to evaluate onset of symptom relief in patients with generalized anxiety disorder. J Psychiatr Res. 2008 Oct;42(12):1024-36.
Küçükdeveci AA, McKenna SP, Kutlay S, Gürsel Y, Whalley D, Arasýl T. The development and psychometric assessment of the Turkish version of the Nottingham Health Profile. Int J Rehabil Res. 2000 Mar 1;23(1):31-8.