A prospective global measure, the Punum Ladder, provides more valid assessments of quality of life than a retrospective transition measure
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Conflict of interest: K. Fletcher, C. French, and R. Irwin disclose that they hold the copyright for the Cough Quality of Life Questionnaire and have collectively received $5,000 over 6 years from industry-sponsored research only. K. Corapi and G. Norman have no potential conflicts to disclose.
PII: S0895-4356(09)00385-0
doi:10.1016/j.jclinepi.2009.09.015
© 2010 Elsevier Inc. All rights reserved.
