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.
Rothman KJ. Computation of exact confidence intervals for the odds ratio. Int J Biomed Comput. 1975 Jan;6(1):33-9.
Rothman KJ. Computer analysis for case-control studies with individual matching. Int J Biomed Comput. 1974 Oct;5(4):241-7.