We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleConstruct validity of the Work Productivity and Activity Impairment questionnaire across informal caregivers of chronically ill older patients.AuthorsGiovannetti ER; Wolff JL; Frick KD; Boult CPublicationValue in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research, 2009, Vol 12, Issue 6, p1011ISSN1524-4733Publication typearticleDOI10.1111/j.1524-4733.2009.00542.x