Groenwold R, Uddin M, Roes K, de Boer A, Rivero-Ferrer E, Martin E, Gatto N, Klungel O. Instrumental variable analysis in randomized trials with non-compliance and observational pharmacoepidemiologic studies. OA Epidemiology. 2014 May 9;2(1):9.
McKenna SP, Williamson T, Renck-Hooper U, Whalley D. The development and testing of UK and Canadian English versions of the Incontinence Quality of Life Index (IQoLI). J Outcomes Res. 1997;1:9-18.
Renck-Hooper U, McKenna SP, Whalley D. Measuring quality of life in female urinary urge incontinence: development and psychometric properties of the IQoLI. J Outcomes Res. 1997;1:1-8.