HRS Bibliography
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Journal Article
Combining direct and proxy assessments to reduce attrition bias in a longitudinal study. Alzheimer Dis Assoc Disord. 2013;27(3):207-12. doi:10.1097/WAD.0b013e31826cfe90.
. http://www.ncbi.nlm.nih.gov/pubmed/22992720?dopt=Abstract