Validation of two methods of data collection of self-reported medicine use among the elderly

Landry, J. A., Smyer, M. A., Tubman, J. G., Lago, D. J., Roberts, J., & Simonson, W. (1988). Validation of two methods of data collection of self-reported medicine use among the elderly. Gerontologist, 28(5), 672–676. https://doi.org/10.1093/geront/28.5.672