Oksuzyan, A., Sauer, T., Gampe, J., Höhn, A., Wod, M., Christensen, K., & Wastesson, J. W. (2019). Is who you ask important? Concordance between survey and registry data on medication use among self- and proxy-respondents in the Longitudinal Study of Aging Danish Twins and the Danish 1905-Cohort Study. Journals of Gerontology, Series A: Biological Sciences and Medical Sciences, 74(5), 742-747. doi:10.1093/gerona/gly104.