Assessing polypharmacy in the older population: Comparison of a self?reported and prescription based method, Van der Heyden, Johan, Berete Finaba, Renard Françoise, Vanoverloop Johan, Devleesschauwer Brecht, De Ridder Karin, and Bruyère Olivier , Pharmacoepidemiology and Drug Safety, Jan-12-2021, Volume 30, Issue 12, (2021)