Mansfield CA. A consistent method for calibrating contingent value survey data. South Econ J. 1998;64(3):665-81.
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.